Happy Trampoline is the home of world’s safest trampoline who only deals in Trampolines. Happy Trampoline offers the most comprehensive trampoline lines, right from 10ft round to 16ft and 23 ft round, rectangles, and octagons of all sizes. As we only deal with trampolines, so we are much aware with safety precautions and therefore we place a very high emphasis of safety in our trampoline. We use galvanized heavy duty springs, which is made of high quality steel wire to protect against corrosion and rust. Our trampolines use the 8.5” springs, which is able to endure heavy weight.