i thought the entire purpose was to stay in motion until stopped . do they stop on their own?

yes, they will do stop on their own after 50-60 seconds

Does this thing get rusted?

No. We have had ours for a few years now and it is still in like new condition. No rust

What is the length? The title states 11" while the product descriptions specifies 9".

The length of the marble base is 9.06 inches, the width is 6.69 inches, and the diagonal length of the marble base is about 11 inches.

we had one before from a mall and the balls were tangled so we couldn't use it does this one have the balls where they don't tangle ?

The one I ordered through Amazon was packaged very carefully with each ball and string wrapped in plastic. The strings were not tangled. The unit has not tangled; the balls are heavy weight and seem to be good quality. I am sorry that you had that experience. I enjoy the cradle so much; it is intriguing.

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- CERROPI Newton Cradle Balance Balls, Newton Pendulum with 7 Balls, Classic Newton Swing Ball, Science Physics Gadget | Desk Toys & Accessories, 70+ Sec Swingtime, Marble Base, Black

Product ID: 179489659

⏳70+ sec swing time

🧵Nano-tech ultra-thin nylon lines

🪨Elegant marble base

$178.67

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖤 Elevate your desk game with timeless physics in motion!

NANO TECH DURABILITY - High-impact nylon lines crafted with cutting-edge nano technology ensure ultra-thin yet unbreakable support.
SLEEK MARBLE BASE DESIGN - A premium marble base adds a touch of sophistication to your workspace, blending science with style.
BONUS SPARE BALL INCLUDED - Never miss a beat with an extra ball and easy wire replacement manual for uninterrupted flow.
MESMERIZING 70 SECOND SWING - Experience the longest, smoothest oscillation that captivates your desk and mind alike.
TRUSTED SATISFACTION GUARANTEE - Backed by a 60-day warranty and hassle-free returns, your purchase is risk-free and rewarding.

The CERROPI Newton Cradle features 7 perfectly aligned balls delivering over 70 seconds of smooth swing time, supported by ultra-durable nano-technology nylon lines and anchored on a stylish marble base. Designed for adults and kids alike, it’s a premium desk toy that combines educational value with elegant home or office decor, backed by a 60-day warranty and a spare ball for lasting enjoyment.

Specifications

ASIN	B082CNJXXF
Age Range Description	Adult/Kid
Best Sellers Rank	#22,909 in Toys & Games ( See Top 100 in Toys & Games ) #188 in Educational Science Kits
Brand Name	CERROPI
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (1,477)
Educational Objective	Logical Thinking
Included Components	1PC Newtons Cradle
Indoor Outdoor Usage	Indoor
Is Assembly Required	No
Item Dimensions	9.06 x 6.69 x 6.69 inches
Item Type Name	science-kits
Item Weight	2200 Grams
Manufacturer	CERROPI
Manufacturer Maximum Age (MONTHS)	720.00
Manufacturer Minimum Age (MONTHS)	60.00
Manufacturer Part Number	2056
Manufacturer Warranty Description	60 Day Warranty Against Manufacturer Defects
Material Type	Marble
Model Number	2056
Number of Players	1
Operation Mode	Manual
Size	Medium
Supported Battery Types	No batteries required
Theme	Home Decor
UPC	715668938236 746653837340 745245575738
Unit Count	77.6027 Ounce

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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$178.67

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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