Features: 1. Strong shrinkage, can be better to protect wires. 2. Easy to use, don't need any complex instrument. Material: Polyolefin Shrinkage Ratio: 2:1 (will maximum shrink to 1/2 its supplied diameter) Minimum Shrinkage Temp: ≥84°C Full Shrinkage Temp: ≥120°C Operating Temperature: -55°C to +125°C Tensile strength: 10.4 Mpa Dielectric strength: 15 KV/mm Manufacture specification: ISO9001 Flammability: Flame Retardant Approvals: UL Approved Cutting method: sharp About this item Environmental & safety: made of polyolefin, shrinkage ratio: 2: 1, 15KV/mm dielectric and flame retardant, soft and flexible, acid and alkali resistance. Easy to use- exposed to heat source for a few seconds at 70℃, Sleeving wrap would shrink rapidly at least 1/2 diameter. Multiple sizes- wrap cable sleeve, satisfied for your different needs. Box organized- colors heat shrink tubing including Black, Red, Blue, yellow, Green, total 150-750 pcs, well organized in a storage box for easy access and carry. Usage- suitable for electrical insulation, wire bundling, colour coding, mechanical protection, wire/cable joints and daily repairs etc. note: if you use light or candle to heat up the tube, please make sure that the flame is at least 1 cm away from the tube, or the flame may to black marks on the tube, which not only impair its appearance, also may burn your Electric wire. Suitable for any project workshop, fixing the broken wires, electrical insulation, mechanical protection, wire bandwidth, wire connection, wire ends process, wire/cable junctions, daily repairs, color Coding, etc.