Shoulder rub and muscle knot self-massage tool. Great for the shoulders, back, arms, and other little spots. Made in USA: Washington Materials: Plastic Gives deep, penetrating trigger point and muscle tension relief while sliding smoothly over clothing Fits easily in the palm of your hand Hard, firm, and smooth surface Portable, easy to pack size Non-slip grip ensures secure, controlled muscle manipulation Three different curves to apply varying degrees of pressure Easy to clean—wash with soap and water, or an antibacterial gel Offers 2.