The STX Alliance is revolutionizing the game. The Alliance is a series of shafts all with different levels of flexibility, aka FLEX. The Alliance shafts are available in six different levels of FLEX, from 60 (low flex) to 225 (max flex). STX's FLEX is a reflection of how many pounds of pressure it takes to bend the shaft a quarter of an inch. These flexibility levels are based on player weight and experience. A novice 110 pound player doesn't need the same amount of flexibility in his or her shaft as an expert 200 pound player. For example if you're a 165 pound player who's been playing for more than five years, you'd use the 135 Alliance shaft. However if you're a 165 player who's been playing less than five years, you'd pick the 110 Alliance shaft.