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 16 gauge of the Adrenaline 130 focuses on durability and power for the pro player.