Ergon 3 OPTIONS Tilt 2 - knee tilt 3 - knee tilt w/lock Arms N - no arms P - fixed, vinyl L - fixed, leather A - adj, vinyl R - adj, leather Size A - a size/high back K - b size/midback B - b size/midback C - c size/high back Back Angle N4 - not adjustable AJ - adjustable Base/Frame Finish BU - black umber MT - medium tone BU MT