Precision Drafting Chair Base Dimensions: 25" Dia. GREENGUARD: Yes. Assembly Required: Yes. Color: Black. Chair Functionality: Pneumatic Seat Height Adjustment, Back Height Adjustment, Seat Depth Adjustment, 360 degree Swivel. Tools Required: No. UPSable: Yes. Meets Industry Standards: ANSI/BIFMA. Wheel / Caster Style: Dual Wheel Hooded Carpet Casters. Wheel / Caster Size (Diameter): 2". Material(s): Nylon. Back Height Adjustment: 2" range. Seat Size: 17 3/4"W x 16"D. Back Size: 16 1/4"W x 14"H. Seat Height: 23" to 33". Capacity - Weight: 250 lbs. Fire Retardancy: CAL 117-2013. Upholstery: 30% Polyester/70% Olefin. Finished Product Dimensions: 25"Dia. x 42 to 54"H. Finished Product Weight: 29 lbs.