Can a fountain pen improve your health? Sailor thought so. For their 85th anniversary, they released a pen treated with “Hado” wave energy, a popular pseudoscience in 1990s Japan. They claimed it would not only write smoothly but also improve the user’s immunity and blood circulation.

Sailor’s Theta pens, released in 1996, were inspired by a spiritual concept called hado. The nibs were said to be treated by a hado specialist and purportedly had mysterious health benefits.