1 Each. Wobble stool is a compact and ergonomic solution to poor posture and back pain. Its inflatable wobble seat combined with the wobble base encourages continual micromovements to take pressure off your spine, release muscle tension, promote proper circulation and strengthen your core. Height-adjustability allows a myriad of different positions and accommodates all sizes. Rubberized, weighted base holds the chair in place for maximum stability in active sitting. Wobble stool is perfect for any workplace or home environment.