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. Fine Line Markers are great for detail work. Brush Tip Markers offer the artist the control and flexibility of a brush for creating thick, thin or varied lines. Chisel Tip Markers are ideal for smooth lettering, outlining, covering large areas, and freeform drawing. Non-toxic.