HellermannTyton Heat Shrink Tubing, Type TRN21 12.7/6.4 Flexible Non-Adhesive, 600 V AC, 1/2 in Inner Dia Expanded, 1/4 in Inner Dia Recovered, Thin Wall, 0.024 in Wall Thickness Recovered, 2:1 Shrink, 50 ft Length, -67 to 275 deg F, 212 deg F Shrink, Cross Linked Polyolefin, Black