1. HEAVY DUTY MOP HEADS: Our commercial string mop head refills are made with super absorbent natural cottonsynthetic blended yarn, a quality material to improve floor cleaning performance. They feature highly absorbent quickdrying speed, are lint , machine washable and long lasting. 2. VERSATILE APPLICATIONS: The universal mop heads are designed for floor applications in commercial, industrial, residential and school use. They are scratch , suitable for wet and dry mopping, perfect for cleaning various surfaces, such as tile floor, wood floor, laminate floor, stone floors, windows and even cars, bringing more convenience in daily life. 3. EASY REPLACEMENT: These string mop heads are universal and easy to replace and install. The universal size of the commercial mop head fits most clampsstyle/side loading handles and most of the wringer basket. (Mop handles are sold separately) 4. EFFICIENTLY CLEAN: Our replacement heavy duty mop head refills feature double loopedend construction which can keep mop ends from fraying, effectively prevent the mop rope from falling and knotting, making cleaning more efficient. When placing the industrial mop head on the floor, it can achieve maximum surface area , making cleaning easier.