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