Prismacolor Premier Fine Line markers. Permanent, premium pigmented ink is non-toxic, archival quality, acid free and lightfast.It is also water resistant, has no bleed through and is smear resistant when dry.(Results may vary based on paper characteritics.)Ideal for crisp lines and detail work. Great for quick sketching, outlining and creating texture. Available in five nib sizes - .005, .01, .03, .05, .08Also available in assorted sets.