The new Beast XP string is the world's first thermo-poly string, featuring a secret alloy additive, which delivers improved trajectory control and feel for extreme precision. Prince's thermo-poly string technology balances velocity and spin to control the ball, without compromising your swing, regardless of string tension, pattern or racquet type. Now you can really unload with a heavy shot knowing that you will get powerful spin and controlled ball trajectory without worrying about hitting a flyer. Prince's Beast XP strings feature optimized dynamics and friction, displacing and returning within two milliseconds, delivering at least 9% more spin to your game than other strings. Additionally, monofilament polyester strings are known for rapid tension loss. Prince's Beast XP retains its tension longer due to a special manufacturing process of sequential heating and stretching, aligning the polymer chains to ensure that the consistency of string tension is maintained across a wide variety of conditions and racquets.