---
product_id: 573175042
title: "GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S"
brand: "ravensburger"
price: "$155.81"
currency: USD
in_stock: true
reviews_count: 9
category: "Ravensburger"
url: https://www.desertcart.us/products/573175042-gravitrax-flextube-accessory-stem-toy-for-kids-ages-8-up
store_origin: US
region: United States of America
---

# Raises marble run by 4 height tiles Configurable 60°, U- and S-shaped tubes 4 FlexTubes for dynamic track design GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S

**Brand:** ravensburger
**Price:** $155.81
**Availability:** ✅ In Stock

## Summary

> 🌀 Elevate your marble run game—where gravity meets creativity!

## Quick Answers

- **What is this?** GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S by ravensburger
- **How much does it cost?** $155.81 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/573175042-gravitrax-flextube-accessory-stem-toy-for-kids-ages-8-up)

## Best For

- ravensburger enthusiasts

## Why This Product

- Trusted ravensburger brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable & Engaging:** Built to last for endless hours of educational fun for ages 8 and up.
- • **Universal Compatibility:** Expand any GraviTrax set—no limits to your marble run imagination.
- • **Customizable Track Angles:** Shape your race with flexible 60°, U-, and S-shaped tubes for unique stunts.
- • **STEM-Driven Creative Play:** Boost critical thinking and spatial skills with hands-on physics experimentation.
- • **Seamless Multi-Level Connections:** Effortlessly link different track heights for gravity-defying marble runs.

## Overview

The Ravensburger GraviTrax FlexTube accessory enhances your marble run by connecting multiple track levels with four versatile FlexTubes and height tiles. Designed for kids 8+, it supports STEM learning through hands-on play, is compatible with all GraviTrax systems, and adds dynamic angles and stunts to your track for endless creative possibilities.

## Description

Connect different levels of your tracks with the “GraviTrax FlexTube” and keep the fun racing along!What comes up, must come down, and with the “GraviTrax FlexTube” you’ll easily change your marble’s direction and track level in a race to the finish! Four FlexTubes are included, and each may be configured in a 60-degree angle, u-shaped or s-shaped tubes to add extra stunts to your amazing marble run. The set also includes 4 height tiles to raise your run even higher! It’s a snap to combine “FlexTube” with any “GraviTrax Starter-Set” to experience the power of gravity and educational fun today!What makes a great toy? GraviTrax checks all the boxes! It’s a creative, modular, expandable track system that challenges children to use their imagination to design and build their own marble runs! Electronic-free, GraviTrax construction sets use STEM-friendly concepts while building critical thinking and problem-solving skills. Completely open-ended, every GraviTrax set has a boredom-busting variety of play options for hours of fascinating fun. Once the basics are mastered, simply add expansion sets and accessories to propel those metal marbles around the tricked-out track of your dreams!Comes complete with 4 FlexTubes, 4 height tiles and instructions. Lasting durability for girls and boys ages 8 and up, it’s the learning toy children (and savvy adults) return to over and over again!

Review: really cool addition, especially for gravitrax Pro - This is definitely a useful element. It is able to control speed (like after magnetic cannons), take sharp turns and make u turns. I found it really fun to make a Flex Tube go through a transparent level into another curve. I'd say this is not a 100% fun element, but it definitely allows for really fun things to be done. If you have a pro gravitrax set, buy these! They each get the marble down 3.5 height tiles (the height of a pro element), and can be used as bernoulli rails in some situations. If you do not have gravitrax pro just yet, then think about buying them, they might not be as useful, but they will definitely be used in some situations. If you don't have gravitrax pro, I'd give this set a 9/10, but if you have it, I'd give it a try and a 10/10.
Review: Good toy - Great. adds some emphasis to my tracks and allows me to send the marbles down so I can work on other pieces of my track.

## Features

- [GraviTrax: FlexTube] Connect different levels of your tracks with the “GraviTrax FlexTube” and keep the fun racing along!
- [INNOVATIVE] The GraviTrax interactive track system allows you to design and build your own race tracks and experiment with gravity, magnetism, kinetics
- [STEM TOY] Boys and girls ages 8 and up can experience educational and science play. The franchise has sold over 15.5 million units worldwide and has ranked as the No.1 marble run system in the U.S., according to the NPD Group.
- [COMPATIBLE] Easily extend play time - All sets are compatible and functional with all GraviTrax systems
- [GREAT GIFT] GraviTrax is an a ideal holiday and birthday gift for creative, curious kids and adults who love to build.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BSXKP3TS |
| Age Range Description | 8+ |
| Best Sellers Rank | #367,386 in Toys & Games ( See Top 100 in Toys & Games ) #284 in Marble Runs |
| Brand Name | Ravensburger |
| Customer Reviews | 4.7 out of 5 stars 150 Reviews |
| EU Spare Part Availability Duration | 1 years |
| Educational Objective | Creative Skill, Imagination Development, Problem Solving, Reasoning Skill, Spatial Awareness |
| Global Trade Identification Number | 04005556224296 |
| Included Components | 1 Instructions, 4 FlexTubes, 4 Height tiles |
| Item Dimensions | 4.45 x 4.45 x 2.17 inches |
| Item Type Name | Marble Run |
| Item Weight | 0.1 kg |
| Manufacturer | Ravensburger |
| Manufacturer Maximum Age (MONTHS) | 1200 |
| Manufacturer Minimum Age (MONTHS) | 96 |
| Manufacturer Part Number | 22429 |
| Material Type | Plastic |
| Model Number | 22429 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Set Name | FlexTube |
| Size | Small |
| Sub Brand | GraviTrax |
| Theme | Marble Track |

## Images

![GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S - Image 1](https://m.media-amazon.com/images/I/71fTbKDMU-L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ really cool addition, especially for gravitrax Pro
*by J***E on February 2, 2025*

This is definitely a useful element. It is able to control speed (like after magnetic cannons), take sharp turns and make u turns. I found it really fun to make a Flex Tube go through a transparent level into another curve. I'd say this is not a 100% fun element, but it definitely allows for really fun things to be done. If you have a pro gravitrax set, buy these! They each get the marble down 3.5 height tiles (the height of a pro element), and can be used as bernoulli rails in some situations. If you do not have gravitrax pro just yet, then think about buying them, they might not be as useful, but they will definitely be used in some situations. If you don't have gravitrax pro, I'd give this set a 9/10, but if you have it, I'd give it a try and a 10/10.

### ⭐⭐⭐⭐⭐ Good toy
*by G***N on May 22, 2025*

Great. adds some emphasis to my tracks and allows me to send the marbles down so I can work on other pieces of my track.

### ⭐⭐⭐⭐⭐ Creativity
*by K***R on March 31, 2025*

Very challenging for my 8 year old grandson. Lots of creative designs he can build on. Wants to get more bridges.

## Frequently Bought Together

- Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S
- Ravensburger GraviTrax: Jumper Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S
- Ravensburger GraviTrax: Scoop Accessory | Marble Run & STEM Toy for Boys & Girls Ages 8 & Up | Accessory for 2019 Toy of The Year Finalist

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-20*