Kable Kontrol’s 2:1 heat shrink tubing slides easily over small inline splices and connectors, and shrink down to 50% of its original diameter to fit snugly over any wire, hose or cable management project.. Self-extinguishing heat shrink tubing is tested and approved for use under UL VW-1 and CSA OFT material standards. Kable Kontrol® 2:1 Polyolefin Heat Shrink Tubing - 1/2" Inside Diameter - 10' Long - Green Additionally, it is in compliance with RoHS, the European directive on the Restriction of Hazardous Substances.