Sold as 1 Each. Mesh Task Office Chairs. Back Dimensions: 18'W x 17.5'H. Assembly Required. Mid-Back Design with breathable mesh material. 5-Star Nylon Base with Dual-Wheel Casters. Color: Black; Material: Foam, Mesh, Metal, Plastic, Plywood, Polyester. T-Arms. ANSI/BIFMA compliant for safety. Padded Mesh Upholstered Seat with CAL 117 Fire Retardant Foam. Overall Dimensions: 24.75'W x 24.75'D x 34' - 38.5'H. Rated for up to 250 lbs Based on 6-8 Hours Use. Warranty: 1 Year Limited. 360 Degree Swivel Seat. Seat Dimensions: 17' - 21.5'H x 19'W x 18'D. Care Instructions: D-Dry Cloth. Contemporary Task Chair with T-Arms. Pneumatic Seat Height Adjustment.