Tyke size height adjustable Nimbo posterior walker. Aluminum Frame. Soft rubber wheels adhere to any surface and will not allow the Nimbo to slide backwards. One directional rear 5" wheels with aluminum ratchet and pin mechanism. Anti-Reverse override bracket disengages the one directional rear wheels and allows forward and reverse mobility. Front swivel 4.5" wheels enhance maneuverability and ease of turning. Locking mechanism easily switches front wheels from swivel to non-swivel. Each wheel is independently adjusted. 75-pound weight capacity. This walker comes castle red in color. Flip up seat accessory shown sold separately.