Terrans 3:1 heat shrink tube are designed to best seal, secure, and insulate electrical components. Commonly found in wire runs or terminal connections, heat shrink tubing can keep your electrical setups protected. - high Quality  - Waterproof - Long service life - High Strength Toughness - Corrosion resistance - Good electrical insulation - High temperature resistance How to use it? 1. At First choose the right size tubes, as It is 3:1 heat shrink ratio, and will shrink up to 1/3 of original diameter, please measure diameter of wire which is equal to the size of tube after shrinked.  2. Wrap the cable wire with the tube, then use a lighter heating if the tube is small or hair dryer, heat guns heating for large one until the wire was wrapped tightly. 3. Don't touch the tube until it becomes cool. Specification: - Color: Black and Red - Material: Polyolefin - Heat shrink ratio: 3:1 - Operating Temperature:-55°C to + 125°C - Minimum Shrinkage Temp: 70°C - Full Shrinkage Temp: 110°C maximum - Tensile strength: 10.4Mpa - Dielectric strength: 15 kV / mm - Flammability: Flame Retardant Package Includes: Φ1/8"   - length 1.5", total 78 pcs (black - 39 pcs red - 39 pcs) Φ3/16" - length 1.5", total 52 pcs (black - 26 pcs, red - 26 pcs) Φ1/4"   - length 3",   total 25 pcs (black - 12 pcs, red - 13 pcs) Φ3/8"   - length 3",   total 12 pcs (black - 6 pcs, red - 6 pcs) Φ1/2"   - length 3",   total 14 pcs (black - 7 pcs, red - 7 pcs) Φ3/4"   - length 3",   total 12 pcs (black - 6 pcs, red - 6 pcs) Φ1"       - length 3",  total 6 pcs (black - 3pcs, red - 3 pcs) Plastic storage box - 1pcs  
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