Four-ply, cut-end yarn. Absorbent natural cotton fiber for general mopping. Rayon has immediate absorbency and wet release properties ideal for finishing. Cotton/synthetic blend absorbs 5.5 times its weight in water. 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. Cotton 20-oz.