ITEM NAME:328Pcs 2:1 Ratio Polyolefin Heat Shrinkable Tubing Sleeving Wrap Cable Kit MO.328pcs x Heat Shrink Tubes. Eco-friendly heat shrinkable tube does not produce toxic and harmful substances. Assorted set contains the most popular 2:1 heat shrink tube of 8 sizes. Shrinkage Rate:2:1 Max Temperature:125 °C.