Mop Head, Economical Lie-Flat Head, Cotton Fiber, 20 oz, White, 12/Carton Premium, four-ply yarn mop lies flat on floor. Standard 1/4" threaded bolt head for easy screw-in mop head change. Use with lie-flat screw-in mop handle, sold separately. Wrapped with a galvanized metal outerband for the utmost in durability.