uni-ball Signo uni-ball 207 Premier Roller Ball Pen, Silver Barrel, Medium Point, Black Ink 6 pack &hellip; Valve-action marker writes on virtually any surface: glass, metal, wood, rubber, stone, plastic, paper, vinyl, leather, canvas and more Quick drying ink marks opaque and glossy on light and dark surfaces The archival-quality, acid-free, oil-paint ink is fade-, water, and abrasion-resistant, ideal for projects that need to last Ink is permanent and certified AP-non-toxic.