40mm-13mm Adhesive Lined Polyolefin Heatshrink Sleeving. Adhesive Lined Shrinks down to a 3-1 ratio = 13mm High quality 3:1 dual wall (adhesive lined) heat shrink tubing. Packaged in 1.2 metre lengths. Available colours: black only •Inside diameter 39.0mm (as supplied), 13.0mm (after recovery). •Wall thickness 1.0mm (as supplied), 2.54mm (after recovery).