Heat Shrink Tubing Heavy Wall Material Polyolefin with Adhesive Flexible Flame Retardant Yes Adhesive Lined Yes Shrink Ratio 3 1 Use With Wire Size 4/0 AWG to 250 MCM I.D. Before Shrinking 1.5 in I.D. After Shrinking 0.5 in Wall Thickness After Shrinking 0.13 in Length 48 in Shrink Tubing Properties Abrasion Resistant Color Black Temp Range -67 Degrees to 230 Degrees F Package Style Individual Pieces Min Shrink Temp 257 Degrees F Dielectric Strength 600 V