The Weidmuller HS-HF 19.5-38.1/50 MM Y Heat shrink markers with 50.4mm diameter and a yellow color is a two component system that is designed for marking and identification of cables and wires. It's made from a heat shrinkable polyolefin sleeve and a printed heat-sealable adhesive band. When exposed to heat, the adhesive shrinks and adheres to the sleeve, creating a sealed construction that resists water, oils, rubbing, and other environmental conditions. The 2:1 shrinking ratio provides superior insulation, strain relief, and strain strain prevention. It is flame retardant and corrosion resistant, and has an operating temperature range of -55°C to +135°C.