Arkwright LLC Silversure Antimicrobial Treated Microfiber Cleaning Cloths - Case of 240 - Washable and Reusable Cloth (12 x 12 in). MINIMUM ORDER: 1 case of 240 Silversure cloths. (Packed as dozens x 20 packs). COLOR OPTIONS: Blue, Grey, Green, Yellow. SIZE: Each cloth is 12 x 12 in. 30 grams/piece. Silvadur-treated Microfiber (Antimicrobial) HIGHLY EFFECTIVE MICROFIBER CLEANING SUPPLIES: Extensive testing proves Silversure treated microfiber cloths with SILVADUR (TM) antimicrobial technology. SILVADUR (TM) uses silver ions proven to be highly effective in protecting against odor-causing microorganisms. Our antimicrobial treated microfiber cloths inhibit the growth of harmful microbes that could otherwise propagate within the microfiber cloth's fibers. MICROFIBER CLOTH ECOLOGICAL CERTIFICATION: Our antimicrobial treated microfiber cleaning cloth is approved as non-toxic by Oeko-Tex international standards and is certified to be 99.9% effective in destroying microbes after 50 washes.