Heavy Duty Trampoline Springs:Trampoline springs are made of premium grade galvanized zinc steel to protect against rust caused by natural acids,moisture,and oxidation for your springs. Trampoline Springs 5.5inch:The springs dimension is 5.5inch trampoline springs,and about a 350pound children can enjoy the jumping all the seasons. Trampoline Springs Heavy Duty for CalmMax,Skywalker,BCAN Trampoline:Exacting manufacture match and are dead on spec wise accurate for trampolines from 8ft to 14ft. Stainless Steel Trampoline Replacement Springs:Great replacement springs is extreme strength to trampoline,strong quality steel,exactly to replace some old stretched springs or damaged springs. Warm Tip:Please measure the length of spring from hook end to hook end before purchasing. Take a spring off from the trampoline and make sure it is fully recoiled before measurement. 5.5inch trampoline springs