The Rapidline Laboratory drafting chair comes with a moulded polyurethane seat pan and back rest, contoured waterfall seat and infinite tilt lock for complete sitting adjustment | Moulded Polyurethane Seat Pan and Back Rest | Contoured Waterfall Seat | Back Height Adjustment | Seat Tilt With Infinite Lock | Back Tilt With Infinite Lock | Gas Height Adjustment | Chrome Plated Height Adjustable Drafting Ring | 5 Star Black Nylon Base With Castors