Based on this product's specifications, here are some alternatives and similar models
Fineliner pen Sakura Pigma Micron 01 — 0.25 mm, permanent pigment ink, purple
Summary description:
Sakura Pigma Micron 01 fineliner with 0.25 mm nib delivers precise, consistent lines for drawing, technical sketches, note-taking and illustration. Uses permanent, fade- and water-resistant pigment ink in purple, suitable for archival work, mixed-media and pen-and-ink techniques. Supplied as a single pen (MPN XSDK0124).