Based on this product's specifications, here are some alternatives and similar models
CellPack CR 6.4/3.2mm Heat Shrink Tubing, Black
Summary description:
The CellPack CR 6.4/3.2mm heat shrink tubing is a high-quality insulation solution designed for electrical cable protection and cable management. With a shrink ratio of 2:1, this black tubing provides reliable sealing and mechanical protection for wires and connections. It is suitable for professional electrical installations, offering durability and resistance in various industrial and domestic applications.