PEEK is Just Another Plastic (so is polyester, and nylon – aka. “synthetic gut”) PEEK is a high temperature, engineering grade polymer (aka. plastic) known as polyetheretherketone. According to the online encyclopedia, Wikipedia, “Polyketones are a family of high-performance thermoplastic polymers. The highly polar ketone groups in the polymer backbone of these materials gives rise…

exerpt from Hand and Wrist Institute’s website: Certain types of strings can also increase the odds of injury. Polyester strings are stiffer, and therefore cause more vibration to the hands and wrist whenever the ball is hit. Natural gut or nylon strings are somewhat softer, and do not transmit much vibration to the upper extremities….