12mm-4mm Adhesive Lined Polyolefin Heatshrink Sleeving. High quality 3:1 dual wall (adhesive lined) heat shrink tubing. •Inside diameter 12.0mm (as supplied), 4.0mm (after recovery). •Wall thickness 0.8mm (as supplied), 1.78mm (after recovery). Packaged in 1.2 metre lengths. Available colours: black only.