Maruman Mnemosyne “Inspiration” Notebook
Named for the Greek goddess of memory, the Maruman Mnemosyne "Inspiration" is a Japanese-made grid notebook perfect for sketching or writing in, whether you're using a fountain pen or something like the Sakura Pigma micron.
Inside are 70 micro-perforated, A5-sized, slightly-off-white pages bound firmly together with a twin-ring system. Every page has subtle graph lines that guide your drawings without being obstrusive. It's an all-around beautiful notebook.
Get it for $14 on Amazon.