SALE Chalkboard & Chalkmarker Calendar Set (9-Pack Liquid Chalk Markers) - Safe, Non-Toxic Brilliant Colors, 6mm Reversible Tips. Odorless, Erasable Crafts Art Supplies for Kids. Water Based BOLD, VIBRANT COLORS: Complete art projects or create an unforgettable art set for kids with bright, beautiful colors that can safely be used on sealed chalkboards, glass, metal, vinyl and a ton of other non-porous surfaces. VERSATILE & PRACTICAL: Liquid chalk markers are great for kids who love drawing, learning and playing, but theyre also great for work calendars, bistro boards at a restaurant, scrapbooking, or creating a sign for storefront windows. SAFE, REUSABLE & EASY TO CLEAN: These water-based long-lasting art supplies remove easily with a damp cloth and come with two replacement tips. Everything you need to write, craft and create like never before. INCLUDES SELF-ADHESIVE CALENDAR: Each order comes with both the 9-piece liquid chalk marker set and a bonus chalkboard calendar you can use at work or at home. Keep track of holidays, anniversaries, appointments and more! UWANTED INK RESIDUE TIP: At the end of each month, colours blue, white & purple sometimes leaves residue after wiping. ADD SOME LIQUID SOAP TO A CLOTH AND WIPE THE RESIDUE AREA AGAIN WITH A LITTLE MORE VIGOUR THEN WIPE SOAP AWAY. This should hopefully clear the residue.