Great quality at superb prices. Perfect for the classroom, they provide a good colour laydown with strong pigmentation. The generous 3mm cores are encased in soft white linden wood, which is from a sustainable source. The triangular barrels offer comfort and grip and ensure pencils will not roll off desks. The set of 12 contains the 12 standard colours. The set of 24 contains the 12 standard colours plus an additional 12 colours not available individually. The Class Pack contains 24 each of the 12 standard colours.