At the butt, ACCRA has added a carbon weave material, which not only adds strength to the butt section of the shaft but also moves the CG (center of gravity) slightly more towards the butt section of the shaft. Features: From a swing weight perspective, this counter balancing effectively makes the iSeries wood shaft an optimal choice for the new heavier driver heads It also promotes an easier release and a draw bias, perfect for the great majority of golfers. Golf Shafts from the True Temper brand.