Based on this product's specifications, here are some alternatives and similar models
Trampoline Spring Master SPRĘŻYNA DO TRAMPOLINY MASTERJUMP SUPER by Master, model MASTRSP14S
Summary description:
Replacement trampoline spring Master SPRĘŻYNA DO TRAMPOLINY MASTERJUMP SUPER (model MASTRSP14S). Metal coiled spring designed for restoring tension and bounce in compatible outdoor or indoor trampolines. Intended as a direct replacement part from brand Master to maintain jumping performance and safety. Use for repair and maintenance of MasterJump-compatible trampoline frames and mats.