This is a good quality fitball, also known as a swiss-ball or gym-ball.Made of burst-resistant heavy gauge PVCAvailable sizes: 55cm, 65cm and 75cmBlue onlySuitable for both exercise, rehab, or as a seat (at your desk to keep core-strength up).Size guide (rough guide - all depends on what you want to do with it!):55cm - Suitable for heights 140cm-165cm,65cm - Suitable for heights 165-180cm, 75cm - Suitable for heights 180 cm
