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The design of an expansion spring is relatively simple, consisting of a coil of wire that is wound tightly together in a helical shape. When a force is applied to the ends of the spring, the coil is stretched out, causing the spring to expand. When the force is removed, the coil contracts back to its original position. The amount of force required to stretch the spring and the distance it will expand can be adjusted by changing the size and thickness of the wire, as well as the number of coils in the spring.

Welded mesh, also referred to as expanded metal or expanded steel mesh, is a type of metal fabric that is created by stretching a sheet of metal and then welding the strands together at regular intervals. This process results in a strong, lightweight, and porous material that can be used in a variety of applications.