The TREDUX-38,1/19,1-BK is a black TREDUX thin-wall Heat Shrink Tubing made of cross-linked polyolefin and offers 3:1 shrink ratio, conforms to highly variable substrates and replaces many different sized tubing solutions by fitting almost any heat shrink task. The 319-03800 tubing is used for general electrical insulation and mechanical protection of cables and wires.