Platinum

Platinum is a Japanese maker of fountain, ballpoint, and rollerball pens. Their fountain pens take a proprietary ink cartridge or piston converter. Their ballpoint pens take various proprietary metal or plastic body refills plus a D1 (standard multifunction) size refill. Their rollerball pens take metal or plastic body refills that adhere to the standard ceramic rollerball (RB) size.

Manufacturer’s Website: Platinum Pens