The Afton Aquatic Jumping Trampoline is made of Stainless steel frame (SUS304), high standard pure anti-rust material. Jumping in the water brings more fun to trainers. High Density suction cap could fit to the flooring tightly which make the rebounder more stable. Different from traditional common spring trampolines, we are using 100% imported natural rubber elastic cords. Which guarantee the trainers' comfort. Protect the trainer's knees, back and neck muscle.