Tray for Feeder Seat Systems can be adjusted in both angle and height. Can be used with the Floor Sitter Wedge Feeder Seat and the Mobile Floor Sitter. Tray Features: Non-slip work surface measures: Small/Medium/Large 23"W x 22"D (58 x 56cm) - X-Large 32"W x 23"D (81 x 58cm). Adjusts in height from: Small/Medium/Large 14" - 20" (35.5 - 51cm) - X-Large 20" - 30" (51 - 76cm).