Amazing! No wood casing just pure water-soluble graphite in a stick! There are so many things you can do with Derwent Watersoluble 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 4 wash strengths from a light to a very dark wash. Contains 2 Watersoluble Graphitone sticks (2B and 8B), 2 Graphic Pencils (2H and HB), 2 Graphite Blocks (Soft and Medium), a plastic eraser and a sharpener.