CMI-GCX2-BK and CMI-GCX2-GY are the product numbers. Gray and Black Total Height Range: 51.2"-54.3" Backrest; 130-138 cm 86 cm in height, 33.9" in backrest width, 58 cm in armrest width from 22.8" to armrest, 72 cm in armrest to armrest, and 28.3" in seat width (including sides) 54 cm / 21.3" Seat Depth 54 cm / 21.3" Seat Thickness 11.5 cm / 4.5" Armrest Adjustability 30-37 cm / 11.8"-14.6" Floor to Seat Top 50-58 cm / 19.7"-22.8" Height Adjustability 8 cm / 3.1" Armrest Width Adjustability 1.5 cm / 0.6" Recline 90-180 degrees Armrest 4D (forward, sway, lift, and swivel) Ultra-comfortable memory foam headrest Ultra-comfortable memory foam for lumbar support Perforated PU for the outer layer and cold-molded foam for the inner layer Steel Base Material for the Frame (leg) 75 mm / 3.0" Aluminum Caster Gas Lift Class 4 Maximum Weight Load 150