Prismacolor Premier Illustration Markers feature archival, acid-free premium pigmented ink to prevent works from deteriorating over time. Lightfast colors maintain their vibrancy (results may vary based on paper characteristics). The permanent, water-resistant ink will not bleed through and is smear resistant when dry. - Prismacolor Premier Illustration Markers - 01, Basic Colors, Fine Line, Set of 4Prismacolor Fineline Illustration Marker, BASIC CLRS 4/CT SET - Contains four markers with a 05 nib, Brush Tip, or Chisel Tip in Black, Red, Blue, and Green.