This is a GBS024MBL Heat shrink sleeve manufactured by BM Group. It is glueless, with a 2:1 shrink ratio, and a tube diameter of 2.4mm. The sleeve length of 11 meters is made of Polyolefine, and is designed to protect wires, cables, and other electrical components. It works by shrinking around the item, providing insulation and preventing any potential damages resulting from environmental factors such as water, dust, abrasions, and other mechanical damage.