LIQUID CHALK WHITE SUPERIOR MARKERS: Exclusively To You Extra Free Tips. Unique Pens With Reversible Tip Ideal for use on all non-porous surfaces including mirrors, glass, windows, ceramics, whiteboards and vinyl chalkboards. Xylene-free so perfect for asthmatics and allergy sufferers. Includes four (4) extra tips to give extended life to your markers. Environmentally friendly; water-based, non-toxic and child-safe. These wet-wipe markers are so suitable for use in a wide variety of applications including schools and nurseries, restaurants, cafs, diners, retail stores and car dealerships. Pack includes eight bold neon colors with reversible tips; use them as either chisel tip or bullet point markers.