Heat Shrink Tubing Heavy Wall Material Cross-Linked Polyolefin with Adhesive Semi Rigid Flame Retardant Yes Adhesive Lined Yes Shrink Ratio 3 1 Use With Wire Size 250 MCM to 500 MCM I.D. Before Shrinking 2 in I.D. After Shrinking 0.63 in Wall Thickness After Shrinking 0.16 in Length 18 in Shrink Tubing Properties Solvent Resistant UV Light Resistant Color Black Temp Range -55 Degrees to 110 Degrees F Package Style Individual Pieces Min Shrink Temp 248 Degrees F