Featuring antimicrobial protection of the brush fibers. Flexing action for under the rim cleaning. Flexible brush gets under the rim! Clorox - committed to helping you achieve a cleaner and healthier home. This Clorox Cleaning Tool is made with antimicrobial materials to help inhibit the growth of bacteria on the brush fibers. The materials are built into the brush fibers during the manufacturing process to provide continuous protection that won't wash off, or wear away over time. Questions? Call 1-800-320-8045. Made in China.