C style pens are ideal for Roman, texts, italic lettering and for accented line drawing, scrolls and scripts. Pen sizes decrease as numbers increase, C-0 being the largest and C-6 the smallest. Pen holders sold separately. Use with Speedball No. 9451 Pen n Holder , General's Cork Grip Pen Holder , Koh-I-Noor No. 130N Crow Pen Holder , or Speedball Classic Pen Holders . Set of 6 includes one each of C-0, C-1, C-2, C-3, C-4 and C-5 of the C series pen sizes and a pen holder. Set of 4 includes C-1, C -2, C-3 and C-4 of the C series nibs, two fine Hunt nibs for ornamental work and a pen holder.