Remastered Aeron size A backrest with PostureFit. Will only fit size A chairs. Not size C, not size B. This is the graphite color frame. Used, with scratches, scuffs, etc. NOTE: THIS HAS THE FIXED POSTUREFIT BACK SUPPORT SYSTEM. THIS IS JUST “POSTUREFIT, ” NO SL. POSTUREFIT (NON-SL) IS A REAL OPTION FROM HERMAN MILLER AND IS NOT AVAILABLE TO REGULAR CONSUMERS IN THE US. For whatever reason, Herman Miller hides fixed Posturefit from their US website and you have to custom order it from a dealer. Fixed Posturefit is, however, readily available to consumers in the UK. PostureFit is also detailed in the official Herman Miller Aeron price book.