Heat Shrink Tubing, Heavy Wall, Material Cross-Linked Polyolefin, Rigid, Flame Retardant No, Adhesive Lined No, Shrink Ratio 3:1, Use With Wire Size 3/0 AWG to 400 MCM, I.D. Before Shrinking 1.5 in, I.D. After Shrinking 0.5 in, Wall Thickness After Shrinking 0.17 in, Length 25 ft, Shrink Tubing Properties Abrasion , Acid and Alkali , UV Light , Color Black, Temp. Range -67 Degrees to 230 Degrees F, Package Style to Length, Min. Shrink Temp. 250 Degrees F