Nippon N.S. Pro Zelos 6 .370" Iron ShaftsDESCRIPTION ZELOS 6 was created in pursuit of a lighter, stronger, more tenacious steel shaft that would satisfy for a lifetime. The remarkable light weight was achieved by combining our state of the art matching technology with NZNS 60, an original ZELOS material. This combination preserves the unique trajectory and stable direction of steel shafts while extending flight distance from similar weighted carbon shafts. The advanced ZELOS 7 steel shaft