15'/14' /13'/12'/10'/8' Trampoline Size: Dia.15/14/13/12/10/8/6feet Frame: 45/42/38mm galvanized steel tube Jump Mat: PP Mesh cloth from USA Safety Pad: Outside Rubber/Plastic material Inside EVA Foam Springs: heavy-duty springs with galvanized, more longer and more stronger. Case Qty: 1pc The frame tube is stronger galvanized steel (double galvanized for inside and outside) than Disport and Practicer model , and Ø 48mm , 42mm, 38mm to be used. Also the welding joints and holes were with galvanized work. The frame is sturdy, and it will withstand hard jumping and wear for years. The trampoline mat is made of super heavy-duty, fade-resistant polypropylene fabric, which is UV-Resistance and with careful and firm sewing. Longer length of heavy-duty galvanized steel-wire springs provide the best bounce on round trampolines. More springs mean higher bounce. Deluxe safety pad, filled with thicker and soft impact-Resistance EVA foam. Extra-wide Rubber/Plastic pad cover is weather-proof UV resistant for all-weather during the year if setting outside. All trampolines tested by T Ü V-GS and EN-71, and meet or exceed TÜV-GS standards