Amazon Basics High-Density Round Foam Roller for Exercise, Massage, Muscle Recovery – 12″, 18″, 24″, 36″ Featured! $9.96 – $20.13 Make sure this fits by entering your model number. High-density blue speckled foam roller with molded edges: Extra firm – best for intermediate and above. High density expanded polypropylene (EPP) that is designed for deeper massage than standard foam roller Ideal for balance, strengthening, flexibility, and rehab exercises