The 2700 Series Seat Back System provides trunk support for riders with low muscle tone or balance issues. The removable 9 inch wide by 10 inch tall padded back can be adjusted by large knobs up/down. Quick-release cam lock levers allow the two removable padded lateral supports to adjust up/down, forward/back and swing in/out. A strap secures lateral supports in front of the rider. Features a build-in push grip for parent/guardian. The 2700 Seat Back System can be used with a saddle seat, bench seat, or tractor seat.