The Gardner Bender 3/8 in. Heat Shrink Tubing (3-Pack) provides abrasion and moisture protection for electrical wire and cable. This tubing is constructed of flame-retardant polyolefin. Meets UL 224, 125 degrees Celsius; CSA C22.2 #198.1, 125 degrees Celsius; MIL-DTL-23053/5, Class 1 and 2, AMS 3636 and 3637; DEF STAN 59-79, Issue 3 Type 2a