"The Med Balls are ideal to perform various group and individual exercises. Their peculiarity is that they bounce and, by providing a good grip, they grant an ideal load to train for several sports activities, such as basketball and volleyball. They can be inflated in order to increase their bouncing degree, or filled with water in order to increase their weight, extending this way the range of possible exercises. A booklet with some exemplifying exercises is included in the package. The Med Balls can be inflated with a needle pump. Also available in : 2 Kg. Ø Cm. 23 & 3 Kg. Ø Cm. 32. "