Tension Springs are also known as Cable Springs. They are plastic covered, and designed as a lateral suspension system, stretched across the shortest distance in either a seat or back, usually from side to side.
Upholstery Tension Springs are straight, tightly-coiled springs and range in size from 14 Inch through to 23 Inch in length. The hooks are included, already part of the spring itself. They are plastic covered to ensure that they do not catch the seat fabric. Often used with a metal plate for fixing. Ideal for wooden or metal frames.