9mm-3mm Adhesive Lined Polyolefin Heatshrink Sleeving. Adhesive Lined. Shrinks down to a 3-1 ratio = 3mm High quality 3:1 dual wall (adhesive lined) heat shrink tubing. Packaged in 1.2 metre lengths. Available colours: black only. •Inside diameter 9.0mm (as supplied), 3.0mm (after recovery). •Wall thickness 0.64mm (as supplied), 1.4mm (after recovery). •Available in black only.