Pick your work surface shape and match the bookbox to any of the Prodigy colors. MODEL SHAPE HEIGHT DESK P506 Rectangle 24''-33'' Adj 20''x26'' P507 Soft Rectangle 24''-33'' Adj 20''x26'' P508 Teaming 24''-33'' Adj 20''x26''OPTIONSPermaTuff EdgePlywood Core Work SurfaceSolid Plastic Work SurfaceBlack EdgeNon-Skid GlidesQ-Ball GlidesSteel Glides