When space is a premium, our chair desk offers a smaller footprint than a standard combo. MODEL SHAPE HEIGHT DESK D25X A+ 18'' 22''x20.5''x14'' D25A A 18'' 22''x20.5''x14'' D20X - NBRK A+ 18'' 22''x20.5''x14'' D20A - NBRK A 18'' 22''x20.5''x14''OPTIONSPermaTuff EdgeSeat and Back PadsSeat Pad OnlyBlack EdgeNon-Skid GlidesQ-Ball GlidesSteel Glides