Despiau Grade Guide
A • • • Quality : Very regular and fine grain, very strong medullary rays on the whole surface.
B • • Quality : Regular and fine grain, strong medullary rays.
C • Quality : Fairly fine and regular grain, well pronounced medullary rays.
D Quality : Wider and fairly regular grain, quite pronounced medullary rays
E Quality : Very wide and less regular grain, less pronounced medullary rays.