Product description boron fuel injected a stunning tour inspired design with an injection of boron for added ball speed and distance the mp 25 is the first true high ball speed iron grain flow forged for the feel and touch indispensable on tour for tour players to lowmid handicaps the first true distance iron for tour players the mp 25 is the first to start with a pre determined tour dictated profile and then engineer ball speed rather than cramming a distance technology into a smaller shel