Inks flow smoothly on the surface and wipe away clean with a dry cloth or eraser. Formulated so it doesn't leave a residue. Use for marking on white boards and most non-porous surfaces, including glass. Unique patented thumb cap lets users release the cap with one hand. Long-lasting markers feature durable plastic construction. Finish contains MicrobanÂ® to inhibit the spread of odor- and stain-causing bacteria.