There are 3 major muscle supports in the plantar surface of the foot, and 3 therapeutic rolling wheels on the Footwheel to effectively treat them. The FootWheel provides the many documented benefits of trigger-point therapy and myofascial release. Its purpose is to stretch & relax the plantar fascia and extinguish myofascial trigger points. The Footwheel is easily cleaned with warm, soapy water and may be sterilized if needed. Made of nylon and steel for durability.