Pentel Arts colored pens feature non-toxic, vibrant, water-based ink that will not bleed through paper. Fine lines are perfect for small spaces and detail work. Pentel art markers feature durable bullet point, fiber tip pens in a handy, recloseable carrying case for easy travel. Leak-proof, airtight cap prevents dryout. Ideal markers for artists, designers, students, more. AP certified by ACMI. Colored art pens and markers available in sets of 12, 18, 24, and 36.