The GBS127BBI is a 100-meter-long heat shrink sleeve manufactured by BM Group. It is glueless, has a 2:1 shrink ratio, and has a 12.7mm diameter. The sleeve is made of polyolefin, a thermoplastic polymer, which is used to insulate and protect wires and cables. It is resistant to moisture, chemicals, and abrasion and provides a secure, tamper-proof seal. The sleeve shrinks when heated, wrapping tightly around wire and cable bundles for a secure fit.