RediSharp Plus markers permanently mark on virtually any surface & features Microban antimicrobial protection that lasts the lifetime of the product. Built-in antimicrobial protection continuously fights the growth of microbes, such as stain-causing, odor-causing bacteria. Unique patented “Thumb Button Cap” allows one-handed cap release. Specially formulated water-based ink will not bleed through paper & is odorless. RediSharp Plus markers are great for CDs & offer rubberized grip for comfort & control. Certified AP nontoxic.