RockBalls Infinity are ready whenever and wherever you are. Coupled with our original RockBalls and RockFloss, they make a perfectly portable mobility toolkit. Two balls fuse together in the new RockBalls Infinity to provide dual-action relief to sore muscles and joints. Roll Infinity down your spine to relieve back pain*, or target painful calves and hamstrings with twice the pinpoint accuracy. Every set of RockBalls Infinity includes a special Movement Manifesto, a booklet that contains valuable information to educate users on the following: -How to use RockBalls Infinity. -Detailed movements and exercises. -Helpful hints about best ways to use RockBalls Infinity. -Breathing and proper alignment. -Differentiating pain* from discomfort. -A full reference section that will appeal to medical professionals interested in learning more about movement techniques.