Allows individual to turn up to 360o * Makes getting on or off a seat or chair easy and comfortable - Car seats too! * Durable and stable with an 300 Lb. weight capacity * Portable: Weighs only 3 1/4 Lbs. * Diameter: 15 5/8 * 1 year Limited Warranty Shipping Carton Size: 18 L x 17 W x 5 H