Quality reference of trampoline:
1) Jumping mat: made in the USA
2) Foam pad: EPE, closed-cell foam that will not absorb water, mildew or lose shape
3) Pad: PVC( 500D,1000D) fabric
4) Tubes: galvanized inside and outside
5) Springs: super high-strength galvanized
Main trampolines:
1) Single trampoline
2) Two beds trampoline
3) Four beds trampoline
4) Six beds trampoline
5) Eight beds trampoline
6) Ten beds trampoline
7) Bungee trampoline