150 Pcs 2:1 Heat Shrink Tubing Sets Cable Sleeving Wire Wrap Heat Shrinkable Tube Kit 8 Size Black Red Material:Polyolefin; Color: Black and Red Shrinkage Ratio: 2:1 (will maximum shrink to 1/2 its supplied diameter) Minimum Shrinkage Temp:+70C, Full Shrinkage Temp:+110C maximum Operating Temperature:-55C to +125C Tensile strength:10.4 Mpa, Dielectric strength:15 kV/mm