Expo - SAN16001A Adapt and evolve your ideas with ease using EXPO Wet-Erase Markers. Their marks are permanent until you want them gone. Smudge-free ink stays put when dry, but with water-activated erasing technology, they wipe clean with water. Ultra-fine tip markers are great for precision and clarity. Use these markers for adding details and embellishments to your calendar or marking on small spaces whether on glass, whiteboards and other nonporous surfaces.