Amazing! 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! Use the stick whole or break it into chunks to create broad sweeps of tone really quickly then, just add water and watch the graphite dissolve into softness! You can choose from four wash strengths from a light to a very dark wash.