The GBS254MNE Heat shrink sleeve with glueless 2:1 ratio is a 25.4mm long, 3.5m long product with polyolefin material manufactured by BM Group. Heat shrink tubing provides a physical barrier that helps to protect and insulate electrical wires and cables, as well as to improve its ability to resist substances such as water, oil and vibration. It is often used to insulate electrical joints, spliced wires, and to bundle multiple cables together, and is also used to add strain relief and additional protection to larger cable bundles and hoses. The glueless option is perfect for applications that do not require a sealant or adhesive; this product has a thermal shrinking ability and forms a tight, secure hermetic seal when exposed to heat. The 2:1 ratio allows it to become half its original diameter when heated, making it perfect for tight spaces.