It is extremely unlikely you would need to source a custom spring like this for individual projects.

• For Repair: If a pocket spring unit is damaged, the most practical solution is to replace the entire cushion or panel, not individual custom springs.
• For Projects: If you are building a sofa, sourcing a pre-made pocket spring unit in a standard size and firmness from upholstery supply shops is the feasible route. Working with a factory on custom specifications requires substantial minimum order quantities.

Summary: This product specifies a soft, plush, customized comfort spring intended for use in non-load-bearing parts of high-end sofas, with gauge specifications indicating its softness and intended application.