Introducing Luxilon Smart, a technologically advanced co-poly that combines great feel with impressive all-around playability. As with Luxilon's M2 and Element series, this string is built with a variable flex, enabling it to perform optimally across different stroke speeds. On faster swings, Smart is designed to stiffen so as to provide the attacking player with the needed control to ratchet up the power and spin. On slower or more compact strokes, Smart is designed to play softer for better touch and feel. The upshot is a comfortable co-poly that should work very well for a wide range of playing styles.