water trampoline:0.9mm pvc tarpaulin,3m ,5m,7m ... sealed by USA imported hot air welder machine water trampoline:1.Our inflatable water games are made of most durable 0 ... , This material is unaffected by gasoline,oil and salt water, highly resistant to damage from abrasion,impact and UV. ... is connected by most advanced USA imported hot air welding machine ,which makes the trampoline very strong at seams. ...