Chalk Ink Markers contain a pigment-based, paint-like formula that provides vibrant color and opaque coverage. They are an innovative chalk alternative that works like a paint pen, with the same look and feel of chalk but without the powdery mess. Once dry, Chalk Ink does not smear or come off until removed with water. Chalk Ink blends beautifully, allowing color and texture other markers do not achieve. The markers feature broad 6mm or 15mm tips. Superb for painting on wood, ceramics, pottery, glass and plastic. Chalk Ink is ideal for use by professional artists, home decorators, scrapbookers, businesses and children for artwork, window décor, menu boards, chalkboards, general signage or labeling. Acid- and odor-free, water-based Chalk Ink is a safe and non-toxic product.