Set Of 12 - Blue Liquid Chalk Erasable Markers - 5/8-Inch Tip Pens Designed to be used on non-porous surfaces like glass, glossy black boards and write-on LED signs. Blue ink easily wipes clean with a damp cloth. Liquid chalk flows evenly and dries quickly for a bright presentation. Sold in a pack of 12. Displays2go SKU#: WND16MMBLU