Fade-resistant: The ink of our permanent black markers is waterproof and wear-resistant. It will never wash off or fade from sun exposure! All projects: The durable point won't fray and allows you to write on cardboard, concrete, PVC, plastic, and more! Superior quality: Our marker's no-fray tip ensures smooth, sharp lines with each stroke and our quick drying ink does not smear! Suitable for classrooms: These low-odor markers provide vivid color and comfortable use in any shared environment like schools, study areas, and office meeting rooms ACMI certified: All Avery markers are certified by the Arts and Creative Materials Institute (ACMI) and conform to ASTM D4236.