Material: EPP Foam. Highly Durable, Lightweight, Recyclable, Strong. Suitable for: Arms, Calves, Massaging Glutes, Massaging Hamstrings, Quads, Rehabilitation Exercises. Ease Sores, Helps Lengthen And Stretch Muscles And Tendons, Improves Muscle Health, Increases Blood Circulation, Prevents Injury. Energy Absorption. Design: Logo. Ref: UTMQ153