HellermannTyton Heat Shrinkable Tubing 3:1 Ratio in Blister Packs, HIS-BAG - HellermannTyton 308-31211, The HellermannTyton 308-30211 HIS-3-BAG is a Heat Shrinkable Tubing with a Shrink Ratio of 3:1 in a blister pack. This handy small pack of red tubing, contains 10 pre-cut pieces, each 12 x 200mm in length. The thin walled and flexible tubing has been manufactured from cross-linked Polyolefin The HIS-3 BAG tube pack is ideal for insulation and the protection of cables and harnesses. HellermannTyton 308-31211 HIS-3-BAG-12/4 3:1 Heat Shrink 4.0mm Red (10x20cm)