1.[Standard Size]: Perfect replacement mop head for standard Inner diameter 6.3' spin mop system with Round Shape. (Please make a measurement of your existing mop head for the diameter and shape before you place your order just in case it's not a perfect fit,and the detail show with picture is in the down of the page for your reference and avoid wash the mop head by washing machine due to the middle support is make of plastic) 2.[5 PCS Spin Mop Head Replacement ]:Microfiber Refill Heads Universal for most 360 Spin Magic Mopping. The spin mops replacment suit for Hurrica, Mopnad, Cassabel and Other 360 Spin Mop Systems,standard 6' to 6.3' 3.[Convenience]: Mop Use dry for cleaning up pet hair, dust and debris or use wet for a deep clean on any hard 4.[Easy Install]:Mop heads is easy to install, elastic buckles in both sides, easy to wash