Black Buoy Stool, Purple Seat | Desk chair, Chair fabric, Chair Height-adjustable and designed to promote movement in the workplace, Turnstone's Buoy's curved base engages your core as you tilt, wobble and spin. GO AHEAD, HAVE A SEAT—BUOY IS A MOVING EXPERIENCE. Contoured base lets you tilt and swivel, engaging your core and encouraging active sitting posture. Five and a half inches of height adjustability with the lift of a lever. 20 lbs. with a built-in handle, Buoy is designed to go wherever you go. The Black and Purple one is for sale! $175