Heat Shrink Tubing Medical Grade Thin Wall Material Acrylate Olefin Flexible Flame Retardant No Adhesive Lined No Shrink Ratio 2 1 Use With Wire Size 20 AWG to 18 AWG I.D. Before Shrinking 0.19 in I.D. After Shrinking 0.09 in Wall Thickness After Shrinking 0.02 in Length 4 ft Shrink Tubing Properties Abrasion Resistant Medical Grade UV Light Resistant Color Black Temp Range -67 Degrees to 250 Degrees F Package Style Individual Pieces Min Shrink Temp 250 Degrees F