Polytree 328 Pcs 5 Color 8 Size Heat Shrink Tubing Tube Sleeving Wrap Cable Wire Material: PE. Made of high quality PE, this tube is environmental. 5 Colors: Black, Red, Yellow, Green, Blue. This product has a 2:1 shrink ratio and is both UL and CSA certified for up to 600V at 125 Degree Centigrade. Supplied internal diameter : 1.0mm, 2.0mm, 3.0mm, 4.0mm, 6.0mm , 8.0mm, 10.0mm, 14.0mm minimum; Package Includes: 1 x 328Pcs Heat Shrink Tubing (of 8 sizes).