Pre-owned Steelcase Cobi Task Stool Chair. Graphite (5025)Mesh back with a Purple Patterned Seat, Black frame with a 5 star castered base. Features: - Pneumatic Height Adjustable Seat - Fixed Arms - Flex Edge/Flexing back and seat. - Dimensions 19" D x 19" W x 21"-31" Seat Height, 40"-50" Overall Height.