SKU & Specs Breakdown: AE122AWC. AE122: Aeron Chair with Tilt Limiter & Seat Angle Adjustment. W: Fully Adjustable Arms (Wave lever/wheel adjustable). C: Castors / Base Specs. BK: Black / Carbon Mesh & Frame Finish. Pneumatic gas cylinder, foam arm pads, mesh tension, and plastic hip bolts in pristine condition.