Libman makes mop heads refills for Big Wonder and Big Tornado mops, as of 2015. The company also offers replacement heads for cut- and looped-end mops and dust, microfiber and roller mops.
The Big Wonder refill, made of synthetic material, snaps on and off the mop handle. Big Tornado's refill is polyester yarn, which is odor-resistant. Three bands circle the strings and prevent tangling. The material for the large looped-end cotton wet mop refill is partially recycled. This head fits the standard mop handle of any brand.
The dust mop refill is 100 percent cotton and machine washable when placed into a mesh bag. The roller mop replacement head is a sturdy sponge with raised scrubbing circles.