This 3:1 adhesive lined heat shrink is high quality Polyolefin. The dual wall construction contains a heat activated glue. Great for insulation, protection, and special circumstances. Draws down at 194°F (90°C). Note that up to 15% longitudinal shrinkage is possible. Exceeds SAE AMS-DTL-23053/4 (class 3), and UL 224 VW-1 / CSA OFT specs. Priced and sold per foot (0.305 meter).