Heat Shrink Tubing, Thin Wall, Material Polyolefin with Adhesive, Semi Rigid, Flame Retardant No, Adhesive Lined Yes, Shrink Ratio 2.5:1, Use With Wire Size 12 AWG to 8 AWG, I.D. Before Shrinking 0.38 in, I.D. After Shrinking 0.14 in, Wall Thickness After Shrinking 0.03 in, Length 4 ft, Shrink Tubing Properties Acid and Alkali , Color Black, Temp. Range -67 Degrees to 230 Degrees F, Package Style Individual Pieces, Min. Shrink Temp. 275 Degrees F, Dielectric Strength 600 V