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 works to prevent the growth of microorganisms like bacteria, mildew, and mold. The antimicrobial additive is integrated into the marker barrel, cap and plug during manufacturing, and as a result does not wash off or wear away. Tested against the most common infection causing bacteria*, U-Defense Antimicrobial Dry Erase Markers are over 99% effective in preventing the growth of microorganisms on their surface. With U-Defense you can feel good about sharing with classmates or coworkers.