RockBalls are a great way to perform self-myofascial release with pinpoint accuracy. They are sold as a pair and feature a large spikey ball, a small smooth ball and an instruction book with release trigger points and mobility exercises. *Best of Both Worlds* Two is definitely better than one. The 3.5″ textured ball and the 2.5″ smooth ball give you two tools to break through tough tissues. *Detailed Instructions* Included with every RockBalls is our Movement Manifesto features a multitude of corrective exercises and tissue release techniques. *Conveniently Portable* Corrective exercise can and should be performed anywhere and everywhere. Keep your RockBalls at home, in the car, or even travelling. *Added Bonus: Movement Manifesto* Every set of RockBalls includes a special Movement Manifesto, a booklet that contains valuable information to educate users on the following: * How to use RockBalls * Detailed movements and exercises * Helpful hints about best ways to use RockBalls * Breathing and proper alignment * A full reference section that will appeal to medical professionals interested in learning more about movement techniques Specifications * One spikey ball – 3.5” diameter * One smooth ball – 2.5” diameter * Both are made of rubber