Refill cartridge for Platinum brand fountain pens.
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 Petit1, is a compact fountain pen available in different ink colors. The stainless steel nib is colored to match the color of the ink. It's refillable with cartridges and made of 40% recycled plastic (how green!)
If exposed to extremely cold weather for a long time, ink inside the cartridges is likely to freeze, expand, and push out the stopper, causing cartridges to leak.