Reversible Tips – Reversible bullet tips allow Posca markers to last twice as long as other markers; To reveal the other side of the tips, simply pull the bullet nib out to reveal one of two sides, from 0.9mm to 1.3mm Safety First – Posca markers are non-toxic, which means our pigment formula does NOT contain alcohol like other markers, each Posca marker is water-based which means it’s alcohol-free, waterproof, and still lightfast Versatile – Posca paint markers have been professionally tested and used on over 50 different surface types, which means you’re covered whether you’re using a canvas, fabric, acrylic, metal, surfboard, rocks, windshields, or anything else Creative Minded – Posca paint pens were designed for the creative minded, use our markers for decorating photos, glass writing, skateboarding, t-shirt designs, coloring potted plants, rock painting, embellishing caps, and more These opaque felt tip markers can write on a variety of surfaces including 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 craft work.