JawayTool 127 Pieces Assortment Heat Shrink Tube Wire Wrap Kit Electrical Connection Cable Sleeve Tubing Sets With Durable Storage Case &ndash; Assorted Diameters- 2:1 Shrink Ratio Minimum Shrinkage Temp: +90C; Full Shrinkage Temp: +125C maximum Operating Temperature:-55C to +125C (-67F to 257F) Dielectric strength: 15kV/mm; Tensile strength: 10.4Mpa Approvals: CE Approved, environmental friendly, no toxic heavy metal, no PBB's, PBBO's, PBBE's Top pro quality tubing with long-lasting features; hardly wear out