Uni POSCA PC-17K is a water-based with a 15 mm tip. Permanent markers that has been popular among graffiti artists since the early 80:s but is also a perfect tool for creative crafts and scrapbooking. Opaque ink that covers even dark backgrounds and previous colours. Writes on all kind of surfaces including canvas, metal, glass, wood, fabrics, stone, plastic etc. Uni POSCA PC-17K is great for canvas painting but also sketching or customization of caps, shoes, fabrics, furnitures etc.