Ink wipes away easily with an eraser or dry cloth, so you can use these dry erase markers freely on traditional white boards or to turn sheet protectors into flexible dry erase boards The cap can be left off for up to 24 hours without drying out due to the long-lasting ink formulation Write clearly in small spaces, on glass, plastic and other nonporous surfaces, with these pen style fine tip dry erase markers Enjoy low-odor markers that are ACMI certified and conform to ASTM D4236, meaning they’ve been independently tested and meet strict safety standards for art materials Pack of 6 black white board markers perfect for practice lessons, chore charts, schedules, to-do lists, note-taking, brainstorming sessions and more