These refills are perfect for the low viscosity oil based ink ballpoint pen. Each refill set comes with 2 refill pieces. 

Consider the oil based ink  

Stálogy is a contraction of the words stationery, standard and technology. An award-winning featured notebook collection for the detailed person in mind. First made for editors, the clean lines, minimal elements, and use of space create a most efficient writing and organizing experience. Featured in NY Mag as one of the 7 Best Reviewed Planners.