The Mapping Project Set is designed for mapping, drafting, ruling, rendering fine details, and more. The set includes one standard Speedball pen holder, one small Speedball pen holder, an instructional sheet, and six nibs: 99, 100, 103, 104, 512, and 513EF. Made in the U.S.A. Use Speedball Pen Cleaner to keep your nibs in tip-top shape and extend their lifespan.