Upper Bounce Machrus Upper Bounce 3.5 in. Trampoline Springs, HeavyDuty Galvanized, Set of 15 (Spring Size Measures Hook to Hook) UBHWD-SP-3.5-15 - The Home Depot
Upper Bounce Machrus Upper Bounce Mini Trampoline Replacement Jumping Mat, fits for 40 in. Round Frames, Using 34 3.5 in. springs UBMAT-40 - The Home Depot
3.5 inch Springs - Trampoline Springs | TrampolinePartsandSupply.com
Premium Trampoline Springs - 3.5 inch (Pack of 12,24,36,48) – SkyBound USA
Premium Trampoline Springs - 8.5 inch (Pack of 12,24,36,48) – SkyBound USA
Premium Trampoline Spring (3.5" to 6.5") Thicker Stainless Weather Resistant 3.5 Inches | Walmart Canada