Cobra Men's Amp Cell Offset Driver Offset design: Offers the golfer more time to square the face at impact and provides more heel-biased weighting AMP Cell and E9 technology: Frees up additional discretionary weight for a 12% larger effective face delivering faster ball speeds even on mis hits Dual Roll Technology: A different roll radius on the top of the face versus the bottom of the face allows for increased distance on shots hit above and below the face center line Fukjikura Fuel Shaft