The Merrithew Mini Exercise Ball™ is a game-changing prop that enhances your workout and posture. Ideal for sitting, standing, and lying exercises that target the arms, abs, glutes, and thighs, this exercise ball increases muscle activation by introducing instability to your movements, activating your core and deep stabilizing muscles. You can also use it to alleviate sore muscles or provide low back and neck support during exercise. Product Features: Compact and portable travel companion Non-toxic, hypoallergenic and phthalate-free Includes bonus downloadable exercise guide Anti-burst Straw and plug Available in 3 sizes (7,10,12 inches) Compact and easy to use: We love versatile fitness tools, especially ones that can work your entire body and fold up to fit in your pocket! Our best-selling exercise ball easily inflates to your desired firmness which might vary depending on use. Providing traction and comfort, the soft non-toxic PVC surface is free of all phthalate, is hypoallergenic and is easy to wipe clean. Target problem areas: The Mini Stability Ball is great for targeting those especially hard to reach areas like arms, abs, hips, glutes, quads and hamstrings. Use in self-massage to reduce adhesions and rehydrate fascia: Give your body a healing edge by using your Mini Stability Ball in self-massage exercises to stretches and stimulate connective tissue, ligaments, blood vessels and fascia. Customize and treat muscle knots by varying firmness and pressure by inflating or deflating your ball. Product Specifications: DIMENSIONS Diameter: 19cm (7.5") Diameter: 25cm (10") Diameter: 30cm (12")