Based on this product's specifications, here are some alternatives and similar models
Heat-shrink tubing DeLOCK 20673
Summary description:
DeLOCK 20673 heat-shrink tubing is made of durable polyethylene with a shrinkage ratio of 4:1. Available in black and red, it provides excellent insulation and protection for wires and cables. Ideal for various applications, it ensures a secure fit and is easy to use, making it a reliable choice for both professionals and DIY enthusiasts.