6-pack refill for Tombow Marking Holder. Versatile wax-based marking pencil for smooth, legible writing on a variety of surfaces. Use on both porous and non-porous surfaces, such as ceramics, wood, glass, coated paper, rubber, plastic, textiles, metal and more. Perfect for craftsmen and professional use in industrial environments. Easily erase by wiping with a damp cloth. 4.4 mm Black lead.