Refill for various OHTO ballpoint pens, especially their multipens, the R-4C5NP is a 67mm 'D1' format refill suitable for most multipens and mini pens from Lamy, Faber-Castell, rotring, Parker, Tombow, Zebra and others.
67mm long, 2.4mm diameter.
The R-4C7NP is a fine needlepoint refill with waterproof ink.
Made in Japan
Ohto is a Japanese pen company that made the first Japanese-produced ballpoint pen in 1949. They have been making innovative, quality writing instruments ever since.