Great for strength and stability training, the BOSU(R) Helm is suitable for your home gym. The Helm is made of 1-inch thick vinyl for durability and can be used on top of BOSU or Swiss balls to accommodate a wide range of exercises. Product Features 1 inch thick vinyl accessory Transform standard pushups and planks into stability training exercises Can be used with a Bosu or Swiss ball or on the ground Additional Details Balls sold separately