The HellermannTyton 300-30163 is a Non-Shrinkable Heat-Shrinkable Tubing. It is made of a ployolefin material with a shrink ratio of 3:1. It is flexible, flame-retardant, and has a low smoke emission in case of a fire. It can be used for a variety of purposes, including electrical insulation, strain relief, and waterproof sealing. It is available in multiple colors, including black, white, red, yellow, and blue. It comes in pocket-sized packs, with the tubing cut to a specific length for easy installation.