#1 size by 48 inches of black dual wall Thermfix Plus heat shrink tubing that is semi-rigid and flame-retardant with a polyolefin jacket with a specially formulated adhesive. The tubing also has a dielectric strength of 600 volts and a high shrink ratio of 4:1 with an extended operating temperature range from minus 40 degrees celsius up to 130 degrees celsius. Automotive industry approved, RoHS, CSA and UL compliant.