High quality trampoline tension springs

Trampoline spring

material: spring steel/stainless steel

Wire dia:3mm-3.5mm(as usual)

Outer dia:21-35mm

free length with hooKs:5.5” 6.5” 7” 8” 8.5” 9” 10” 11”…

surface treatment: zinc plated (silver, black, gold…), nickel plated, electrophoresis…