This dust mop's electrostatic properties act like a dust magnet, picking up and holding dust without treatment. Provides better dust collection than untreated cotton dust mops. Ideal for use in chemical sensitive areas, such as laboratories and hospitals. Yarn is extremely durable won't lint or fray, even after many launderings. 2 ply, cut end, 100% nylon yarn. 100% polyester backing. Fast drying, energy efficient saves time in the dryer. 100 to 150 washings depending on consistency of laundry processing in relation to Tuway laundry specifications.