Dimensions:  20 cm (8 in) diameter Material: PVC EAN: 8719327563915 Contains:✔ Tidal Tank Hyro Ball 20 cm (8 in) diameter✔ 2x Carabiners (to attach your own elastic bands)✔ Hand Strap✔ Blue Dye Bottle of 10ml (1/3 oz)✔ Free Air Pump✔ User Manual✔ Unlimited free access to the mobile app (iOS and Android) Standard 1-year warranty. The Hydro Ball adds a big splash of instability and unpredictability to sports-specific movements through the chaotic movement of water within the ball. As you move, the water inside the Hydro Ball shifts, creating a moving resistance that challenges your stability, coordination, and strength.  The various attachments make it extremely versatile, unlocking a myriad of exercises specifically designed to build stability and control. Being small and light, it's portable and can be used at the gym, field, or even at home.