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 & cap during manufacturing, & works to prevent the growth of microorganisms like bacteria, mildew, & 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.