These markers feature a water-erasable ink designed for use on smooth, nonporous surfaces like glass, plastic, and metal. Once dry, the ink will resist rubbing but can be erased by wiping with a damp cloth, letting you write and rewrite as often as you want! Use them to label containers, create signage, or write on windows. Their versatile, double-sided design incorporates both a fine and extra-fine tip, making it useful for a wide range of applications.