PVC-Free Balance Disc - Dual SurfaceMade from TPE (Thermoplastic Elastomers), eco friendly and recycled materials. This balance cushion has the same features as the 35cm Green PVC Cushion but helps to protect the environment as well. Only available in Green. The cushion can be used as a balance cushion to improve your sense of equilibrium, coordination, reaction and motor skills, it is also ideal for muscle exercise and toning. Can be inflated or deflated to change level of stability.