The HSTTT08-48-Q Thin Wall Heat Shrink is designed to insulate and protect wires and cables in high temperature, dry locations - resists corrosive atmosphere. Voltage rating: 600 V. Shrink ratio: 2:1. Temperature range: -88°F to 482°F (-67°C to 250°C). Polytetrafluroethylene (PTFE). 18 AWG (1.9 mm) diameter, 4' (1.2 m) length. Color Opaque. 25 per package.