The Midwest TransFold Choral Riser is ready to go wherever your choir performs. Built-in wheels make it easy to roll from the classrooms to auditoriums or up stairways & into buses or vans. Simply push the gas-spring cylinder to raise the unit into set-up position release it to fold the risers down for transportation & storage. An automatic safety lock keeps risers securely in position. The heavy-gauge steel frame rolls away on casters and supports plywood decks. Place Reverse taper risers between two standard taper sections to configure a straight riser set. Available in 48 or 72 wide units. Back rail & back step available.