Package Contains: 72 x Black Listo 1620 China Marking Pencils (6-Boxes) Writes on multiple surfaces: These Listo grease marking pencils can be used on hard, glossy non-porous surfaces such as plastic, rock, tiles, polished stones, ceramics, glass, and porcelain. Practical Uses: It can be used for photographic purposes such as glossy paper, contact sheets, x-rays and much more. Construction works can use these pencils for tile cutting (water will not erase it), marking on wood, metal, sheetrock, counter tops and much more. You can also use this in the household for writing on your freezer containers, re-sealable bags, glass jars, chore lists and many more things. Take this to the garden and use it on your garden/plant markers because the rain will not erase what you mark. Wipes right off: If you want to wipe away the markings later, just use a soft cloth and a tiny bit of cleaning spray or use a little water/dish soap and some elbow grease and it wipes right off! Refillable: After you finish using the grease stick in the pencil, just pick up a Listo 162 refill for your pencil and keep on writing. Listo 1620 pencils can be refilled with any color Listo 162 refill color.