EX 550 Progressive Hybrid Iron Set #4-SW Graphite Shaft Regular Flex Right Handed P062 The Powerbilt EX-550 hybrid iron set is the easiest set of irons you will ever play. Hybrid design progresses from wide sole on the long irons for forgiveness to a narrower sole on the short irons for precision. Enclosed hollow cavity allows for thinner face and enhanced distance while also creating a higher MOI. SW features traditional wedge design. Graphite shafted throughout the set for distance and feel.