For a cleaner office, classroom, or home experience, U-Defense Antimicrobial Dry-Erase Markers By U Brands provide maximum protection. A silver-based antimicrobial agent is integrated into the marker barrel and cap during manufacturing, and works to prevent the growth of microorganisms like bacteria, mildew, and mold. Featuring everything you love about U Brands Dry-Erase markersbold ink laydown, contoured caps with built-in erasers. You can now feel better about sharing with classmates or coworkers. Marker Ink Type: Dry Erase; Marker Tip Type: Chisel; Marker Tip Size (text): Broad; Marker Color(s): Black.