Tombow MONO Twin Bold Permanent black marker with two durable tips – wide chisel tip and fine bullet tip. Works on a wide range of materials, including paper, metal, plastic, glass, vinyl, porcelain, leather, and wood. Two tips provide options for making thin or thick marks of smear-proof oil-based permanent ink. Durable tips made of polyester fiber (chisel tip) and acrylic fiber (fine tip) stay fresh and firm even after heavy use. Great for marking on shipping labels, boxes, pallets, signs, and more. Anti-roll chisel tip cap prevents marker from rolling off work surface. Water resistant black ink. 6mm chisel tip; 2mm fine tip. Also available in blue and red ink.