Trampoline uses high-quality synthetic bungee, can buffer nearly 85% of the vibrations, provide more sustained and softer elasticity, and protect Knees, Back and Joints, a great choice for health, aerobic exercise, relax. Dia 32mm 's Upgraded Iron frame structure ensures excellent strength, Dia 8.5mm 's high-quality bungee ropes provide strong and soft elasticity, waterproof and wear-resistant high-strength fiber PP mat can bear up to 330 LBS. The trampoline provides smooth, low-impact exercise can improve health, burn calories, build strength, improve balance, relax, promote blood circulation, also significant effects on arthritis, osteoporosis, lymphatic system ,etc. we set an easy-to-follow instructions, specialized tools, videos, only 10 minutes to complete the assembly with our special tool.