With ASTM F381 & F2225 certificates, these 8ft inner net trampolines are safe enough for users. The high elastic jump fabric allows users to do some trampoline tricks freely. Also, an extra basketball set makes the in-ground trampoline sport more entertaining. So, why do people choose the Aotob recreational trampoline? ● BUILT TO LAST: The frame material of the trampoline is galvanized inside and outside, which makes it anti-rust and anti-corrosion and effectively prolongs the service life of 8ft small outside trampolines. ● UNIQUE DESIGN: Thoughtful design is suitable for kids' use. A safe inner enclosure net can reduce the risk of hitting poles.