The smallest wheel in the Chirp Wheel XR line provides a customized massage, targeting plantar fasciitis relief. This wheel uses a harder material as well as thumb-shaped nodes, ensuring satisfaction from those who love a deep tissue foot massage. BENEFITS: Relieves plantar fasciitis and foot fatigue Massage nodes are designed to mimic thumbs for a deep tissue impact Textured pattern provides grip for a stable massage surface and acupressure relief