Derwent XL Graphite is exactly that - extra big blocks of fine art natural graphite, 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.
Tin of 6 includes: Hard, Medium, Onyx Dark, Onyx Medium Soft, Very Soft