CoreX Medicine Ball with Rope 3, 4, 5, 6, 7, 8, 9, 10 Kgs. Take your old one dimensional medicine ball workouts to a whole new level! Ideal for building rotational strength, power, and ripping your core during intense functional training. Almost an unlimited number of dynamic and swinging exercises. Ideal for pattern and repetition training too! Latest construction technology, featuring a textured synthetic rubber hollow constructed shell without water or sand fill  these balls rebound! Available in kilogram increments from 3 to 10 KGs.