Luxilon's Adrenaline strings are the softest Luxilon strings available, making it ideal for hard hitting players who need the durability of a poly without the stiffness. Its composition of Liquid Crystalline Polymer improves playability for tour quality performance and an enhanced game. This new string maintains good tension and is resistant to atmospheric conditions. The slightly thinner gauge of the Adrenaline 125 provides more comfort than the 130 gauge. The "rough" version is made for those who need extra bite on the ball for added spin.