New formulation erases easily and cleanly with a dry cloth or eraser. Improved vibrant color and long-lasting writing. Marks on whiteboard glass and other nonporous surfaces. Durable chisel tip (1/5 ) marks in a variety of widths. Cap can be left off for 24 hours without dry-out. Low odor. ACMI certified to meet Federal standards of nontoxicity; conforms to ASTM D4236. Safe for office school or home.