You get 6 red and 6 yellow wax cores and 6 gray graphite cores, totaling 18. The working pencil refill has a diameter of 2.8 mm and a length of 120 mm. You can use the builder's pencil lead to choose according to the surface color of the drawing area. The gray carpenter's pencil lead is made of graphite, which increases durability; the red and yellow carpenter's pencil lead which is drop-proof and waterproof, and does not dirty your hands when working. The red and yellow carpenter pencil refills can be wiped with a damp cloth. Due to the particularity of the mine, you can erase incorrect marks. Its 2.8 mm diameter allows you to draw in holes that other oily pencils cannot penetrate. The yellow red woodwork leads make dark surface drawing no longer difficult, and can be selected according to the surface color of the drawing area; three colors can be used to mark different meanings to make your sketches clearer and easier to read. These deep-hole automatic pencil leads can be easily marked on the surface of wood, metal, plastic, paper and other materials, greatly improving work efficiency. Mark and write on all material surfaces, including dusty, rough, oily, damp and dark surfaces. Material:graphite colour:As shown Package Contents: 1 * Pencil lead set(With 18 refills) Only 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.