Pentel PROGear Wet-Erase Liquid Chalk Marker - Wet-erase markers use a chalk-based ink to adhere consistently to dry surfaces while retaining its opacity. Chisel tip creates both bold and sharp lines for detailed writing. Versatile ink formula writes on any dry, nonporous material such as glass, metal, whiteboard, plastic, porcelain, glaze pottery and fiberglass. Chalk markers in assorted colors are perfect for meetings, presentations, planning and more.