Brilliant Bee - 18 Mega Pack of Liquid Chalk Markers - Reversible Chisel and Round Tip VERSATILE CREATIVITY  Express your creativity on any non-porous surfaces. This 18-pack of liquid chalk markers are ideal for writing on anything metal, glass, or plastic, such as mirrors, windows, whiteboards, and more. They are not intended for use on traditional chalkboards. VIBRANT COLORS  The high-quality and super-concentrated liquid chalk produces vibrant colors every time. Share your creative talent on menus, bistro boards, storefront windows, food containers, mirrors, and any other non-porous surface. It is recommended to test in small areas before use. REVERSIBLE TIP  The 6mm tip of each marker can be adjusted for fine or broad use. The fine tip is ideal for writing or detail work, while the broad tip is best for broad strokes or bold lines. So, when the stroke of genius hits, youll have the perfect tools to craft your masterpiece. EASY CLEAN UP  These non-toxic, water-based liquid chalk markers are dust-free and wipe clean easily. Simply wipe the surface with a damp cloth and it will disappear without smudging or streaking. Adults love these markers because of the easy clean-up just as much as children do! HOW TO USE  Upon first use, hold marker vertically with tip facing up. Press tip gently to release pressure. Shake well with cap on and upright. Remove cap and press tip to surface for a few seconds until tip fills with ink.