CellPack Heat Shrink Heatshrink w/o adhesive 617828 - CellPack 144392, This product by CellPack is a black heat shrink with a diameter reduction from 12 mm to 4 mm and a shrinkage ratio of 3:1. It lacks adhesive, making it ideal for applications requiring flexibility and easy removal without residue. Common uses include insulating wires and protecting electrical connections. CellPack 144392 Heatshrink Black 12 mm 3:1 Shrinkage No Adhesive