It is a horizontal ruled note refill (001) of the Traveler's note.
Horizontal ruled lines are the ruled lines that I've become accustomed to since I was a student, so many people find this to be the easiest to write.
The Traveler's Notebook uses a 6.5mm ruler, which is between the general A ruler and B ruler.
Since we use original writing paper (MD paper) that is particular about ease of writing, it is difficult for fountain pens to bleed or strikethrough.
Middle paper / 64 pages Horizontal ruled 6.5mm [MD paper] Stitcher binding
H210 × W110 × D4mm
MADE IN JAPAN