High-quality waterproof material: the gray refill is made of graphite, which can increase durability; the red and yellow refills are made of colored wax, which is resistant to drop and water, and will not stain your hands during workPrecise and practical: This deep hole mechanical pencil refill is more sturdy, reliable and practical; its 2.8 mm diameter allows it to draw holes that other oil-based pencils can't enter, so it will be a good refill for your workbecause there are yellow and red woodworking pencil refills, drawing on dark surfaces is no longer a problem, you can choose according to the surface color of the drawing placeWide range of applications: long-nosed marker pen refills can be used for marking tools, woodworking pencils, air carving knives, woodworking tools, dovetail knives carving pens, carving tools, quick caps, glass cutters, glass carving, glass etching, glass marking, Hardened steel etcher, jeweler divider, engraving supplies, center scribe, layout tool, pen scribe, scratcher, scribe pen, metal plate scribe, steel rod, steel welding marker and welding penColour:As shownMaterial:graphitePackage Contents:1 box * Pencil leadOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.