Hardness
soft (B)
Medium (HB)
Hard (H)
Common ruler
Engineer's scale
Diameter
Escuadra 45º/90º/45º
Cartabón 30º/90º/60º
Size
DIN A-0/A1/A2/A3/A4/A5
Weight
Finish
Rough o smoothr
Opaque or translucent
Brilliant or dull
white or coloured