Vibrassager Measurement and Evaluation Devices Nylon construction provides tremendous strength Nylon construction provides tremendous strength & durability This practical text enables patients to engage in beneficial postures activities and exercises to improve present symptoms of patellofemoral syndrome and anterior knee pain and limit future problems This new and innovative rolling massager is equipped with two knobbed wheels that actually vibrate as they are rolled across the back giving a delightful relaxing massage The long graceful handle is easy to grip and can be used as a trigger point tool for those especially sore muscles