TWO SIZES - This liquid chalk marker comes in medium tip for clear lines of various thicknesses and wide tip for bolder, thicker lines. EASY-TO-USE - Valve-activated paint marker - simply push down on the tip to apply paint to your surface. Pressing on the nib opens up the valve releg the color. COMES OFF EASY - Liquid chalk markings can be removed easily from non-porous surfaces using a wet cloth and is good for indoor use as it is dustless, odorless, acid-free, non-toxic. Water-based acrylic paint. APPLICATIONS - Liquid Chalk Marker works on vinyl chalkboards, glass & non-porous menu boards. Great for hand & chalk lettering, stencils, teacher supplies, calligraphy, decorating wedding signs, shop storefronts, milestone boards, menus, LED panels, and contact paper. CARMEL LIQUID CHALK MARKER - This fun arts and crafts marker has a smooth, liquid texture to decorate windows, glass, and non-porous flat surfaces.