Derwent XL Charcoal is exactly that - extra big chunks of fine art charcoal securely slotted in a foam mould, within a useful and protective tin.
Each block differs slightly in size, but average dimensions are 60mm x 20mm x 20mm.
Naturally water-soluble.
Includes 6 blocks: Forest Pine, Mars Violet, Ochre, Sanguine, Sepia, White.