If you are accustomed to using traditional cotton string mops, you'll love the Heavy Duty Microfiber Tube Mop Head. Great for commercial use. Hospitals, government agencies, professional cleaners and schools are moving away from cotton, ammonia, bleach and chlorine. Instead hospitals, government agencies, professional cleaners and schools are diving into the green cleaning microfiber method for safety and for a guaranteed sanitary clean. It attaches with the traditional clamp and you can continue to use your string mop bucket to rinse and wring out. Microfiber is eco-friendly, long-lasting and more effective at cleaning and sanitizing than traditional cotton string mops. Comes in two colors Blue or Green and in two sizes are available in 16oz or 18oz. Remember not to use bleach or fabric softener if you machine wash these. To extend the life of your microfiber see our tips in our FAQ section (Frequently Asked Questions).