If you are accustomed to using traditional cotton string mops, you'll love the microfiber string mop. It attaches with the traditional clamp and you can continue to use your string mop bucket to rinse and wring out. Please note the oz. size is going to be a smaller number than the # size on the mop. For example a 14oz. is a #16 on the mop head or 18oz. is a #20 on the mop head. Microfiber is eco-friendly, long-lasting and more effective at cleaning and sanitizing than traditional cotton string mops. All sizes are available in blue Microfiber. Our #20 size is also available in white Microfiber. 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