The Blueprint irons from Ping are for better players, those looking for performance at the highest level. The S model is a cavity back distance iron offering forgiveness in the lower lofts and the T model is a traditional blade, less forgiving with lower flight flatter trajectory. Stock lofts are the same so combination sets are possible such as Blueprint S long irons and Blueprint T mid and short irons. $1610 steel shafts, $1715 graphite