This trampoline features springs for superior bounce and includes the following features Six 'W' leg construction for added stability Rust resistant steel frame and legs for years of fun Triple wall T Joint design for maximum strength and stability Set screws on the frame and set bolts on the legs for added safety Weather resistant jumping may and frame cover Tested to meet all ASTM safety requirements No additional tools needed and no drilling required A 12' Safety Trampoline Enclosure is available for this trampoline.