JC Crafts 3 Jumbo White Liquid Chalk Markers, 15mm JC Crafts JUMBO bold and bright white liquid chalk marker value pack. Includes THREE 15 mm jumbo markers. Easy to create any bold projects! Enjoy creating decorations. Great for use on windows, glass, mirrors, and the list goes on. Also, perfect for bistro and bar menu boards. Excellent for use on chalkboard stickers, chalkboard contact paper, metal, whiteboards, message boards and all non-porous surfaces. Create with bright ink and bold lines! Dust-free use. Say goodbye to dusty chalk! WARNING!- Remember, if you want to use this on your blackboard or chalkboard you need to seal it first. If in doubt, always test in a small area first and leave for 24 hours. If you want to use it on pourus surfaces such as card, it does not erase. Great gift for any occasion. Get yours today.