The raw brass Cap-O-Matic Space ballpoint pen possesses unique antimicrobial benefits that are extremely useful today. The raw brass composition of the M4RAW is made of 85% Copper and 15% Zinc, making this pen a copper alloy that possesses antimicrobial properties, which were registered by the EPA in 2008. The clip and tip of the M4RAW Cap-O-Matic though are made of steel, while the body of the pen is raw brass. Fisher Space pen is proud to bring to you an antimicrobial pen.