Our 9″ Performance Dipped Springs are made from specially designed high-tensile strength carbon steel and manufactured in the USA. MaxAir Trampolines ensures our springs have the most active coils per inch. Our helical cone ends are tipped with long, round machine hooks with center placement for the sturdiest frame-to-bed attachment to ensure a supreme angular relationship of relative ends. The close wind of the adjacent coils provide the greatest deflection with the highest elastic limit. This creates a maximum stress limit for even the heaviest repeat hitting of trampolinists. The autophoretic resin-based coating process enables these coil springs to endure the most brutal of environments. When grouped together, 9″ Performance Dipped Springs will bounce you skywards up to 20 feet. Attaching a fly bed to our steel frames, you’ll trick out in the sky LIKE. NOTHING. ELSE.