Turn your usual Pilates routine into a new challenge with these MERRITHEW Rotational Disks - 12 in. (Pair). Attach them to the baseboard of your Pilates machine to add variety to your workouts - and to improve your strength. Crafted with durable baltic birch wood in a neutral finish these disks boast a safe non-skid surface. Use sitting or standing. Manufacturer s warranty included.