The Pro-Tec RM Extreme Massager is a Contoured Roller for effective deep tissue massage. Contoured sections stimulate blood flow and allow for a customized deep tissue massage. The 21" size is ideal for rolling both large and small muscle groups. Product Features Handheld Roller Massager provides controlled deep tissue massage Contoured surface effectively wraps around select body parts Non-flexible design provides leverage so you can control the compression level Reduces muscle fatigues and tightness Promotes flexibility Unique steel blue color 21" Length Easy to clean