■ Type: Iron Set ■ Manufacturer: Muziik ■ Model: OnTheScrew BlueIcon II QPQ Finish ■ Shaft: Dynamic Gold S200 ※ QPQ is a type of surface treatment. For ordinary soft iron, the main options are no plating = rusts, and chrome plating = does not rust due to the plating film. Other methods such as ion plating (IP processing) are often used, but QPQ is a composite treatment method consisting of a nitride layer and an oxide film. QPQ stands for Quench, Polish, Quench. It's not just black; it's resistant to rust despite being unplated, and the grooves are less likely to wear down. However, because it is a heat treatment process, it feels slightly harder than no plating. The black head also makes it easier to focus on the ball when addressing it, which is another advantage.