Prismacolor illustration markers. Permanent, pigmented, archival quality ink is acid-free, lightfast, non-bleed, and non-toxic. Water- and smear-resistant when dry. Results may vary based on paper characteristics. Ideal for crisp lines and detail work. Designed for artistic and technical drawing applications. SET OF 7 includes .005, .01, .03, .05, .08, brush, and chisel nibs in BLACK INK.