Safety and Healthy Materials: This foot roller is made of environmentally friendly PVC, strong and durable, not easy to deform. I enjoy only gentle massage but helpful muscle pain relief. Ergonomic Design: Ergonomically designed foot massager for tired and sore feet, plantar fasciitis and heel spur, firmness of two balls of massager studded for acupuncture alternative, this set is excellent for cross fit or yoga targeted deep tissue massage. Effective Function: Specially designed to release tight and uncomfortable muscles, reduce tension , increase blood circulation and eliminate toxins. Locate trigger points and eliminate knots. Releases deep tissue for stiff necks, tight shoulders and back pain. It is excellent for improving athletic performance by increasing blood flow to sore muscles and promoting recovery. Easy to use: just roll your feet over this foot massager once a day on any surface flat like a floor or a wall. Use them at home, keep a set in the office, or add them to your carry-on for on-demand massage therapy wherever you go. Package Contents: 3-piece set includes one massage roller and 2 massage balls. Foot roller length: about 20cm, ball diameter: about 6.5cm. Perfect tool for relieving all types of muscle pain, not limited to the foot, can be used on legs, hand, wrist, shoulders and neck.