Heat Shrink Tubing Heavy Wall Material Cross-Linked Polyolefin with Adhesive Flame Retardant No Adhesive Lined Yes Shrink Ratio 3 1 Use With Wire Size 8 AWG to 6 AWG I.D. Before Shrinking 0.51 in I.D. After Shrinking 0.16 in Wall Thickness After Shrinking 0.09 in Length 6 in Shrink Tubing Properties High Heat Resistant Color Black Temp Range -67 Degrees to 230 Degrees F Package Style Individual Pieces Min Shrink Temp 248 Degrees F Dielectric Strength 600 V