Upper Bounce Machrus Upper Bounce 5 in. Trampoline Springs, HeavyDuty Galvanized, Set of 15 (Spring Size Measures Hook to Hook) UBHWD-SP-5-15 - The Home Depot
KeFanta 7 Inch Trampoline Springs for 15FT 16FT Trampoline, Heavy Duty
Amazon.com : PARTYSAVING |20 Pack| 7" Silver Trampoline Spring Galvanized Steel Replacement with Free T-Hook for Skywalker, JumpKing, Upperbounce, Skybound, APL1239 : Sports & Outdoors