Features String reel Used by many players as a hybrid with natural gut including Roger Federer and other Top 10 players Structural integrity of string is secure as denting is done while string is still soft Widely used in hybrids, mostly as main string for more spin and feel String is completely impervious to atmospheric conditions such as moisture Reduce tension at least 10% lower than nylon strings to provide optimum playability as ALU Power Rough does not suffer from tension loss common to other strings