The FX 500 LS allows for increased comfort thanks to Sonic Core made with Infinergy by BASF -- located at the 2 and 10 o'clock on the racquet, Infinergy is the first E-TPU in the world (thermoplastic polyurethane foam) developed by BASF. Lastly, Dunlop includes PowerGrid String Tech, a denser string pattern in the center and wider at the top of the racket. This technology ensures a uniform distribution of power, especially towards the top of the racquet, which is increasingly used by modern players.