Heat shrink tubing shrinks when heated, forming a tight, protective layer over wires and components. Non-shrink tubing, such as PVC and PTFE, does not shrink but offers similar protection against mechanical damage and environmental factors. Non-shrink tubing is often used in applications where no shrinkage is required, providing insulation and protection for cables, wires, and components in a variety of industries, including electrical, automotive, and industrial sectors.