Boris Becker cranks up the power with the Delta Core 3. This racquet features two new technologies Double Rail Technology and the eponymous Delta Core. At 3 and 9 o'clock, the DRT system features two braces, which strengthen the racquet, helping it resist twisting. The DRT also teams with Delta Core to create an arm-friendly hit. Delta Core technology features carbon nanotubes placed in a triangular shape, which creates a stronger frame, and according to Boris Becker Tennis, helps absorb more vibration. Our TW playtesters found the 110 square inch headsize offers a powerful, yet comfortable and controlled response from the stringbed, even on off-center shots. Our testers found that though the Delta Core 3 has a light static weight, it played as if it had more heft, offering good stability and plenty of feel along with the power. The Delta Core 3 excels at the baseline, giving players plenty of zip on their shots without much effort. This Delta Core 3 is a good option for players who are looking for a lighter weight racquet but still crave the stability and power of a heavier stick.