Based on this product's specifications, here are some alternatives and similar models
Heat shrink tubing CellPack CR 3.2/1.6 - 1/8" black, Model 427521
Summary description:
CellPack heat shrink tubing CR 3.2/1.6 - 1/8" (model 427521) is a black insulating sleeve designed for electrical insulation, strain relief and protection of wire joints and connections. With a nominal 3.2 mm diameter reduced to 1.6 mm after shrinking, it suits cable repair, harnessing and sealing applications in electronics, automotive and general wiring tasks.