3pcs of blue microfiber strands mop refill Material: Fine microfiber. soft, absorbent strings that will not scratch floor surfaces, attract dirt, dust and hair, for both wet and dry use. Dimension and Fit: Mounted rod diameter: 0.8", compatible with all standard US threading pole Reusable and Machine Washable: Made with fine microfiber means it could be washed with all kinds of disinfectants and with high temperature. Air Dry Quickly If Hanging: You don't need to launder them every time.