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 H (hard) can be sharpened to an extra-fine point for creating fine detail, and its hardness makes lighter and mid-tones easier to attain. Details: Black 0.25" x 6" (0.6cm x 15.24cm) stick size 5 sticks Grade H (hard) Breakage-resistant Square shape makes the stick easier to grip