Yoga Exercise Ball-A firm heavy-duty ball, which is burst resistant to 600 PSI. -Made from a high density polymer that resists tearing and puncturing. -Withstands the pressure and weight of all users. -Designed to help you work on those challenging core exercises. -Great for stretching and stability training and/or for toning exercises. -Yoga balls are a key part of developing core strength - The round and mobile surface of the yoga ball forces the core muscles to work harder to maintain balance allowing you to work more muscle groups. -This is an ideal addition to your home gym. Note: Assorted colours. Product may vary.