These refills are designed for the Stalogy 4Functions Multi Pen - 0.5mm. Available in 3 colors, the instant-dry, smudge-free ink formulation is identical to the one in their well-loved Low Viscosity Oil Based Ink Ball Point Pen.
About Stalogy:
"What should have been, is," is the motto of Stalogy, which is a combination of the words Stationery, Standard and Technology. Stalogy aims to create stationery with good design and function, and to improve the "Standard" level of stationery.