Self-Fusing Silicone Rubber Tape made of a specially formulated silicone rubber. The tape has no adhesive but chemically bonds to itself upon contact. Once wrapped the tape forms a permanent seal within 24 hours that is airtight and waterproof. The tape can insulate up to 8,000 volts, withstand a temperature range of -65 degrees F to 500 degrees F. Two rolls Black - 1" wide x 10' length.