This is a new set of Kamui's extremely soft FORGED irons, the KP-103UC. They use S20C, a soft steel among soft irons. These are undercut cavity heads with a good feel, refined through 5 forging processes from round bar stock and then CNC milled. The protective film has not been removed, so these are new heads. Manufacturer: Nakajo Kamui Model: KP-103UC Number of clubs: 6-PW, 5 clubs Flex: S Weight: 270g (7-iron)