The RADSPEED XB (XTREME Back) Driver features an oversized shape (460cc) and back-biased RADIAL WEIGHTING to deliver the longest and most forgiving ball flight with low spin. The RADSPEED XB driver features 20g positioned in the back (14g of fixed weight and a 6g interchangeable weight) to create our most forgiving RADSPEED model. An additional 8g of fixed weight is positioned in the front to lower spin for the longest and fastest ball flights.