Extremely light, the Photon accelerates reaction speed by up to 20%. The Power Channel groove enlarges the string surface without increasing head size, while the Vibra Plate Technology stiffens the head against torsion on impact and interrupts the transmission of shock through the frame to the handle. The result: an exceptionally solid hit with excellent control on off-center shots, and outstanding performance for power hitters. The Photon XL adds 1 cm to the Photon without changing the weight, increasing the power of this already impressive racquet. The extra centimeter is in the handle, allowing players to comfortably shift to a shorter grip as needed.