The Cartooning Pen Set is perfect for all types of cartooning. It is designed for the cartoonist and artist looking to create fine line lithography, cross-hatching, alphabets and uniform line drawings. The set includes one standard Speedball pen holder, one small Speedball pen holder, an instructional sheet with helpful tips and methods, and six nibs: B3, B5, B6, 100, and 512. Made in the U.S.A. B style nibs are also available in sets of 2 adjacently sized nibs. Use Speedball Pen Cleaner to keep your nibs in tip-top shape and extend their lifespan.