All the Prodigy work surface shapes with a wire bookbox. MODEL SHAPE HEIGHT DESK P5B6 Rectangle 24''-33'' Adj 20''x26'' P5B7 Soft Rectangle 24''-33'' Adj 20''x26'' P5B8 Teaming 24''-33'' Adj 20''x26''OPTIONSPermaTuff EdgePlywood Core Work SurfaceSolid Plastic Work SurfaceBlack EdgeNon-Skid GlidesQ-Ball GlidesSteel Glides