Heavy duty yarn. Strong & absorbent. Grip 'n Click ratchet wrings more water! Soak in water before twisting. Family made since 1896. Great On All These Surfaces: wood (do not use on unfinished, oiled or waxed boards or unsealed tiles) & laminate; vinyl & linoleum; ceramic tile; marble; stone. 100% satisfaction guaranteed. It's not just a company. It's our family name. For cleaning tips, visit libman.com. Facebook. Twitter. Greensteps. Assembled in the USA with US and imported materials.