Pre-laundered white dust mop is designed for maximum small dust pick-up. Cotton fiber is spun into a 2-ply, balanced yarn that resists damage due to strong chemicals. A durable, polyester backing with reinforced stress points are sewn with the yarn to create the highest performing mop available. 2-ply, open-end spun yarn. Balanced blend of cotton fibers. Looped-end reduces linting. Launderable. 12 each per case