Size 21mm (7/8″). Shrink tube tape is great for labeling cables, wiring, components, tubing, pipes, and more. Ideal for industrial settings, warehouses, houses, and offices. Type Shrink Tube. Secure 3:1 Shrink Ratio Shrinks to one-third of its size when heat is applied, allowing it to fit tightly around cables and connectors for long-lasting identification.