Supplied in reels for convenience, our 3:1 Heat Shrink Tubing Reels are offered in a choice of nine colours: black, red, green, blue, yellow, purple, gray, white and brown. The Heat Shrink Tubing is made of Crosslinked Polyolefin. Good for electrical insulation, Heat Shrink Tubing is flame retardant, highly flexible and RoHS compliant. This 3:1 Heatshrink Tubing has a minimum shrink temperature of 70ēC, a minimum full recovery temperature of 100ēC and an operating temperature of -55ēC to +125ēC.