10 Fun Colors! With 10 bright neon colors, you’ll have more than you need to let your imagination soar! The possibilities are endless with these smooth-writing, window paint markers for glass that are washable. Decorate your home's windows for the holidays, show your team spirit on your car, or create dazzling diagrams and color-coded presentations at work. Simply shake well, for at least 30 seconds, before initial use or to reactivate the marker. Safe to Use in the Classroom or Office Each water-based and low odor glass marker is ideal for the classroom or the conference room with no fear of strong, distracting smells. Easy to use, just shake, pump the tip on a hard surface, and you’re ready to draw or write. Besides glass, you can use them on other nonporous surfaces, such as white, black, and magnetic dry erase boards for writing notes, creating compelling presentations, or catching ideas when brainstorming. These glass markers glide over the surface and easily wipe off clean, leaving it smudge-free and ready to use. Convenient Replaceable Tips Save money on markers to write on glass with this set that includes 10 replaceable tips. Don’t throw away the marker because of a tip that’s worn down. Simply use the tweezer that comes with the set and easily pop out the old tip and replace it with a new one.