Refill cartridge for the Platinum Preppy Fountain Pen. Colorful and cartridge refillable fountain pens seem to be gaining popularity in Japan. The treasured spirit of writing is captured in a new and modern form. The Platinum Preppy, like the Pilot Petit, is a compact fountain pen available in different ink colors. The stainless steel nib is colored to match the color of the ink. Its refillable with cartridges and made of 40% recycled plastic (how green!)