The Graphitone Graphite Sticks have no wood casing just pure water-soluble graphite in a stick. There are so many things you can do with Derwent Water-soluble Graphitone; you can use it like a pencil but the real fun begins when you peel off the wrapper! The Derwent Graphitone Sticks allow you to try different techniques as well as choosing from four wash strengths from a light to a very dark wash.The graphitone sticks allow you to try new techniques and express yourself in new ways. You can simply use the Graphitone sticks whole or break them into chunks to create broad sweeps of tone. Then, just add water and watch the graphite dissolve into softness. The sticks are perfect for expressive sketching and drawing.This Derwent Water-soluble Graphitone Graphite Sticks set contains; 1 x Light Wash 2B stick, 1 x Medium Wash 4B stick, 1 x Dark Wash 6B and 1 x Very Dark Wash 8B.