CellPack Heat Shrink Heatshrink w/o adhesive 617826 - CellPack 144371, The CellPack Heatshrink without adhesive is blue in colour, with a 3:1 shrinkage ratio suitable for 3 mm to 1 mm. This product is ideal for insulation and protection purposes in electrical applications. The SCHRUMPFS DÜNNW 3:1 model ensures reliable performance in maintaining wire integrity. CellPack 144371 Heatshrink Blue 3mm 3:1 Shrinkage 1m Length