Safco Products 3590GR Optimus Big & Tall Chair, 400 lb. Capacity (Optional arms sold separately), Gray Optimus big and tall high-back swivel task chair with weight capacity up to 400 lbs. Fabric upholstered seat and back with supportive ergonomic cushioning Features pneumatic seat height adjustment 19" to 22", 360 degree swivel, tilt adjust with tilt tension and tilt lock, back height adjustment Heavy duty five star steel base with 2" dual wheel carpet casters Safco Products optional adjustable T-Pad arms Model 3591BL, sold separately