Monarch Materials’ In-Ground Trampoline Ring is designed from 19 gauge galvanized steel that’s been powder coated, providing strength and corrosion resistance. The trampoline frame is separate from the retaining wall so it doesn’t void the manufactures warranty and allows the trampoline frame to easily be lifted/removed for inspection or replacement. The retaining wall is designed in six segments so they are smaller and easier to store, and handle. When installed correctly- the retaining wall will never cave.