Comfortable 889mm (35") stander keeps children in a prone position. Main board, knee board and footboard adjust vertically. Nonslip, removable support blocks 163 x 178mm (61/2 x 7") move to any position along the length of the board. Control internal or external rotation, abduction or adduction with the adjustable Velcro sandals 76 x 178mm (3" x 7") on the footboard. 76mm (3") double-locking castors prevent roll and swivel. Kneeboard is removable for smaller children and infants. Tray is included and adjusts in angle and in height.