"Mop heads"
I really like this product and I'm surprised at such negative reviews. The mop heads do fray over time but I wouldn't expect them to last forever. I really like the design of this system, the bucket is very neat, doesn't take up much room to store. I have large hard floor areas to clean and the microfibre mop head manages very well and gets into corners. It's also lightweight I'm very disappointed that it is being discontinued and I have stocked up on some mop heads before they disappear altogether!