The all newWilsonBurn 100 Countervail was designed for big hitting baseliners looking to blast groundstokes all day long What is Countervail Technology and what does it do you might ask Countervail is an allnew material technology used by NASA for space travel integrated into the racquet to maximize a players energy reduces muscle fatigue and shortening recovery time It does this by transferring less of the balls energy into the players body which decreases the amount of energy you need to expend on each swing High Performance Carbon Fiber is used to provide the stiffness and strength necessary for you to burn through the competition With Parallel Drilling and responsive a 16x19 string bed this racquet has ample amounts of power and spin but with a traditional string bed unlike its spin effect twin the Burn 100S With the new X2 Shaft this new line of racquets has extra long handles by shorten the throat to allow players more room for their hands on twohanded backhands If all of that wasnt enough these racquets come ready to use with the Sony Smart Tennis Sensor