Click Mops have small metal disks are sewn inside the mop to attract the magnets on a Click Mop Frame (sold separately). The weight of the metal disks aren’t sufficient enough to cause laundry issues. Heavy canvas backing provides up to twice the number of washing cycles. Mops do not contain cotton or cellulose material which minimizes the potential for quat binding when using to apply quaternary disinfectants. The color code tabs on the mops can be used to minimize cross contamination. 5″ x 18″.