... and safety net tube. More safe and more strong. Diameter: 6ft., 8ft., 10ft., 12ft., 14ft., 15ft., 16ft.Springs:Material of springs: steelNumber of springs: 48pcs, 64pcs ... : A + B cardboardNumber of layers: 5Color of carton: browntrampolinemini trampolineround trampoline 8ft,10ft,12ft,13ft,14ft,15ft,16ft Trampoline without safety enclosure