Boardwalk Cut-End Lie-Flat Economical Mop Head is constructed with premium, four-ply yarn for added absorbency. Built with a standard 1\/4" threaded bolt head for easy screw-in mop head change. The mop heads are held together and wrapped with a galvanized metal outerband for the utmost in durability. The mop lies flat on floor and is designed for use with a lie-flat screw-in mop handle, which is sold separately.