This is a dotted Traveler's Co. notebook refill with small, subtle gray dots in 5mm intervals. This refill is for the regular sized Traveler's Notebook.
This dotted refill is excellent for drafting graphs/boxes or even as a guide for writing and illustrating! Japanese MD Paper is used in these refills which means the paper is fountain pen friendly and bleed resistant.
Here are some more regular sized refills for your Traveler's Notebook.