Looped-end design lints less, reduces fraying and unraveling. Durable double-sewn tailband prevents tangles and provides more floor coverage with each stroke. Four-ply premium yarn. Choose natural cotton for general cleaning or rayon for heavy cleaning or floor finishing. Standard heads use clamp style mop handles; saddleback heads use clamp or gripper style handles; lieflat heads use lieflat screw-in handles (all sold separately). 12 mop heads per case.Mop lies flat on the floor. Plastic, molded cap with metal 1/4-in. threaded bolt head. Rayon 24-oz.