When accuracy, performance and preservation count, the unparalleled fine nibs and archival ink quality of the Sakura Pigma Micron fineliner pens are the go-to tool for art, work, and play giving you the freedom to think & create. Experience smooth writing, and crisp ink quality that delivers precise points and lines that are ideal for fine detail in writing, sketching, drawing & illustration. Microperm is an ultra-fine line, waterproof, permanent ink pen. The alcohol solvent, dye-stuff colorant ink will mark on nearly any surface including metal, glass, plastic, wood and cellophane. An ideal product for incredible detail, precision and permanence. Note: Alcohol based cleaners will remove Microperm ink from non-porous surfaces.