The Ion series has been developed in collaboration with multiple British Open Champion David Palmer, and the Ion Storm was used for his 2008 British Open victory. All the Ion racquets use Nano-Crystalline Technology (NCT) as an additive to the polymer structure of the graphite frame, for reinforcement at key stress points while allowing for fine-tuning of the weight and balance. The combination of NCT with the Ion frame geometry also effectively reduces frame distortion and torque for a larger sweet spot and greater control for hard hitters such as Palmer. The shaft is flared in 2 dimensions between the bridge and the handle to create a progressive flex, increasing power transfer. The Palmer autograph models, X-Force Black and X-Force Yellow, also feature Power Surge technology. Developed with David Palmer, Power Surge technology, drives the power of the swing towards the racquet head while cutting vibration. The Power Surge can be seen on the sides of the shafts of the X-Force Black and the X-Force Yellow. The X-Force Black is now being used by David Palmer for singles, and he will use the X-Force Yellow for doubles on the North American circuit. Now the same Power Surge is available on the Galaxy PS and Cannon PS.