Micron size 03 - .35mm tip The Sakura Pigma® Micron is a fine-point writing and illustration pen that utilizes the highest quality archival formula - known as Pigma ink. The Micron pens are ideal for both technical and artistic applications, including archival recording, illustration, graphic art, scrapbooking, freehand manga drawings, decorative fabric design, and more! All Micron pens use water-based pigment ink and are non-smearing when dry, waterproof and chemical proof, fade resistant, and don’t bleed through most papers. Meets ACMI non-toxicity standards.