Product Description 1. Choose from 3 sizes and 5 colors Choose from sizes 45, 55, and 65 cm to suit your height and use. Multiple sizes help you find the perfect ball for yoga, abdominal training, pilates, core training, pregnancy exercises, or office chairs. Five different colors suit every mood, style, and preference. 2. Strength and Flexibility Balance balls are excellent for training at the gym or at home. You can train the large muscle groups in almost complete comfort. Stable work is excellent for your core and can also help improve overall flexibility, balance, and coordination. It even stabilizes your posture. 3. Whether you use it as a fitness ball, physical therapy ball, yoga ball, Swiss ball, therapy ball, sitting ball, pregnancy ball, or general fitness ball, you will enjoy lying down, bouncing, rolling, or lifting it. Its tactile lines blend with a smooth, hypoallergenic surface to provide comfortable, non-slip contact with your skin without the sticky feeling. 4. Includes air cylinder + air plug + air pull