Big Trampoline Features:1) The frame tube made by galvanized steel2) Jumping mat: PP mesh/made in USA, UV-resistant3) Pad: PVC (500D) cloth+PE4) Foam of pad: EPE, closed-cell foam that will not absorb water, mildew or loseshape5) Tubes: double galvanized for inside and outside6) Springs: super high-strength galvanized7) All sizes above are approved by TUV-GS, ASTM. producing area:china supplying capacity:15000/month