Fitballs are identical to Gymnic Plus Balls and are made by the same company. They are Recommended by the Canadian Physiotherapy Association. They are, in our experience, the most reliable exercise balls for physical rehabilitation and fitness. Gymnic® Plus Balls resist tearing when punctured and small tears can repaired. They deflate slowly if punctured. Gymnic® Plus Balls are now widely used by rehabilitation, fitness and educational professionals throughout the world. Gymnic® is manufactured by Ledraplastic, an Italian company whose owner is the original developer of the “Swiss Balls”. Made of durable PVC vinyl, 100% recyclable, they test #1 in the European TUV chemical, mechanical and environment product safety. Gymnic® Plus Balls are available in sizes 45, 55, 65cm. Exercise chart included.