These markers can write on a variety of surfaces, such as plastic, metal, wood, glass, plaster, canvas, and more. Paint can be scraped off from nonporous surfaces like glass, etc. but will adhere permanently to porous surfaces such as wood, paper, etc. Water-based pigment ink is non-toxic, lightfast, and waterproof. The ink won't bleed through paper (unlike alcohol-based markers) and is excellent for vibrant signs and craftwork. The bullet tips are perfect for detailing. Adding those final touches can truly bring your artwork to life. These are the thinnest tips out of the entire Uni Posca family of markers! - Tip: 0.7mm Extra Fine Bullet Tip [PC-1M] - 12 Colors Case includes: Purple, Pink, Red, Orange, Yellow, Light Green, Green, Light Blue, Blue, Brown, White, and Black.