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We have upgraded the product so that the trampoline has a longer product life. The frame is made of galvanized steel pipe, also we add the protection of black powder coating in the leg pipe to prevent rust. 4-pieces legs with 8-pieces balanced contact points for better stability and safety. PVC Spring Cover Padding is waterproof. 88-pieces Springs can bear 330 lbs. weight. And added a plastic-steps ladder for kids to up and down stairs.