Is it really 4:1 ratio because inside the box on the tubing is written 3:1

Hi, Yes, this specific ASIN is for the 4:1 ratio. The 3:1 is listed on a different ASIN.

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Wirefy 190 PCS Heat Shrink Tubing Kit - 4:1 Dual Wall Tube - Adhesive Lined - Marine Shrink Tubing - Black, Red

Wirefy 190 PCS Heat Shrink Tubing Kit - 4:1 Dual Wall Tube - Adhesive Lined - Marine Shrink Tubing - Black, Red

Product ID: 450231283

Details

Brand
Wirefy
Colour
Black Red
Item length
1.75 Inches
Item weight
0.57 Pounds
Manufacturer
Wirefy
Nominal wall thickness
0.25

💧Adhesive-lined - waterproof bond

🔥4:1 shrink ratio - max tight seal

🛠️Dual wall - abrasion + strain relief

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Description

🔧 Seal it. Shield it. Own it. The pro’s choice for flawless wire protection.

DUAL WALL DURABILITY - Outer layer resists abrasion while the inner adhesive layer provides strain relief and long-lasting insulation.
VERSATILE SIZE RANGE - Includes 5 popular diameters from 1/4" to 3/4", pre-cut to 1.75" for quick, precise application.
READY FOR ANY PROJECT - Perfect for automotive, marine, home repairs, and hobbyists—organized in a compartmentalized kit for instant access.
WATERPROOF ADHESIVE LINING - Heat-activated glue creates a durable, moisture-proof seal that stands up to marine and outdoor conditions.
ULTIMATE SEAL WITH 4 1 SHRINK RATIO - Achieve a professional, ultra-tight fit that shrinks to a quarter of its original size for unmatched protection.

Wirefy’s 190-piece Heat Shrink Tubing Kit features a market-leading 4:1 shrink ratio with dual-wall, adhesive-lined polyolefin tubing. Designed for waterproof, abrasion-resistant insulation, it covers a wide range of wire sizes and applications—from marine to automotive—ensuring professional-grade, long-lasting electrical connections with UL certification.

Specifications

ASIN	B09NW7954L
Best Sellers Rank	4,934 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 34 in Heat-Shrink Tubing
Brand	Wirefy
Colour	Black, Red
Country of Origin	China
Customer Reviews	4.7 4.7 out of 5 stars (1,236)
Item Dimensions L x W	44L x 44W millimetres
Item Length	1.75 Inches
Item Weight	0.57 Pounds
Manufacturer	Wirefy
Nominal Wall Thickness	0.25 millimeters
Outside Diameter	0.25 Inches
UPC	850026973464
Unit Count	190.0 count

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