Designed for students and demanding artists in search of deep, rich black tones, these charcoal sticks are smooth, blend easily and provide a diverse range of tonal values. Drawing instructors make Nitram a must for their students because it will not crumble or skip when used expressively unlike vine or willow charcoal sticks. Nitram charcoal erases well and is easier to work than other charcoal brands. Grade B (soft) is soft, yet is still able to carry a point. Details:Black0.25" x 6" (0.6cm x 15.24cm) stick size16 packs (5 sticks per pack, 80 total sticks)Grade B (soft)Breakage-resistantSquare shape makes the stick easier to grip