Part of my chair broke a couple months ago (the piston part) and unfortunately AKRacing went out of business so I can't fix the chair, therefore I am selling off the useable parts from the chair I have since I can't fix it so look for my other listings. My chair was max series, but I believe some of these parts are interchangeable with other AKRacing Series, but check your part numbers to make sure. This part is the bottom section of the chair. It's in fairly good usable condition, but does need some upholstery repair to get back to perfect condition. The structure has no problems and it is study. Any questions feel free to ask. This part measures 23" L x 22" W x 4" H.