Heat Shrink Tubing, Thin Wall, Material Polyolefin, Flexible, Flame Retardant Yes, Adhesive Lined No, Shrink Ratio 2:1, Use With Wire Size 4 AWG to 3/0 AWG, I.D. Before Shrinking 0.75 in, I.D. After Shrinking 0.38 in, Wall Thickness After Shrinking 0.03 in, Length 4 ft, Shrink Tubing Properties Acid and Alkali , Solvent , Color Black, Temp. Range -67 Degrees to 275 Degrees F, Package Style Individual Pieces, Min. Shrink Temp. 250 Degrees F, Dielectric Strength 600 V