XIT 404 Aqua Pencil Lead Pack W/Label Slates Accessories by XIT 404 Sold out $4.00 SKU aa0003BK 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out The graphite in the Aqua Pencil Lead Pack is 2 mm in diameter and 3.5" long. There are five sticks safely held in a small tube. The graphite is HB hardness - a lot like the standard #2 pencil. It can write on any slate and Wet Notes.