Versatile wax-based marking pencil refills ensure smooth, legible writing on a variety of surfaces. Use on both porous & non-porous surfaces, such as ceramics, stone, wood, glass, rubber, plastic, textiles, metal, coated paper, cardboard & more. Wax-based medium is water-resistant & works great on both dark & transparent surfaces. Easily erase from non-porous surfaces by wiping with a damp cloth. No sharpening requiredperfect for craftsmen & professional use in industrial environments. Compatible with Tombow Mechanical Wax-Based Marking Pencils. Lead Diameter: 4.4 mm; Lead Color: Red; Includes Erasers (Yes / No): No; Lead Refill Compatibility: Tombow Mechanical Wax-Based Marking Pencils.