This blue dust mop head is sturdy, made from a four-ply cotton/synthetic blend. It is has looped ends, as well as reinforced backing ends and reinforced stress points for extra durability. Wash it and reuse it. It is easy to use, with a slot top/clip-on closure. Head Type: Dust Mop; Application: Floor Maintenance; Mop Head Style: Looped End. ~ Includes one industrial dust head each.UNS1124. 1124. Unisan 5X24 Blue Looped End Dust Mop Refill Slot Pocket.