This Radspeed Ladies XB Driver (Xtreme Back) is inspired by the innovative technology used, Radial weighting. This gorgeous driver features a full spectrum of technological advances in order to help you hit more fairways, more often. The design concept originates from the engineering formula called radius of gyration, which is the distance from the club's centre of gravity to each weight or technology location. Cobra's designers & engineers discovered that by increasing the radius of gyration & the distance between front & back weights, they could achieve explosive speed, reduced spin & incredible forgiveness for the near perfect driver experience. Using radial weighting, the weight is placed in the optimum position in each of the driver's models, thus creating three different but very distinctive performances. The Radspeed Cobra range caters for tour players right through to the weekend golfer, also those who need extra help correcting a slice in their game.