Raptor 27 is an advanced co-polyester that will help big hitters keep more balls in play. This string’s low elasticity translates into remarkable control, a feature that allows advanced players to execute their most powerful strokes without fear of over hitting. Our playtesters found tremendous confidence with this string from the baseline. The exceptional control allowed us to swing bigger when adding spin, resulting in heavy balls that exploded off the court. All in all this is a great option for big hitters who require maximum control and excellent durability without having to trade away too much comfort.