ElectronicsThe Rapid Electronics 5000208 is a set of 36 pieces of 2:1 heat shrink sleeves, designed to wrap around cables or wire to insulate and protect them from environmental elements. These sleeves are made of flame retardant polyolefin, and are shrinkable by applying heat of at least 90°C (194°F). When shrimp is complete, the 2:1 heat shrink creates a tight water-resistant seal. The sleeves measure 90mm in length and feature an internal diameter of 4.8mm.