For use with Derwent XL blocks, or any graphite or charcoal blocks
One groove cube per pack
Create "groovy" marks on paper with the Derwent Groove Cube. Just run your Derwent XL or any other Graphite and Charcoal Blocks along the edge of the Cube to create up to four indentations that play out beautifully on paper. You can also use it to shape the edges of charcoal and graphite blocks.