The Circuit Boot adds a new dimension of effectiveness to weighted tuning forks.The unique, patent-pending design of this boot delivers a focused circuit of amplified sound waves by trapping the vibration between small divots on the boot and the surface of the skin. It's an excellent aid for deeper engagement with digestive organs, fascia, muscles, and bones, and useful for digging into knots and other tense areas.Paired with the Sonic Slider™, users have reported improved muscle tone, immediate pain relief, improved digestion, accelerated recovery from exercise and more.