Liquid Chalk Marker Set. 8mm Chisel Tip Set of 8 by ChalkItUp Markers. Chalk Like Effect. Writes on Whiteboards, Plastic, Glass, Windows, and Smooth-nonporous Surfaces. Used By Teachers, Restaurants, Business Owners, Artists, and Children. No Mess, Easy Clean! Liquid Chalk is also known as Chalk Ink, Window Markers, Glass Markers, Paint Pens 8 Vibrant Long Lasting Colors Works Great on Glass, Plastic, Whiteboards, and Non-Porous Surfaces Square tip to create wide and thin lines Non-toxic; odor free; acid free; xylene free; lightfast