Bests & Worsts Reviews from Amazon

I was disappointed and I am wondering if I received the same product of all the happy customers. The issue I encountered was that the abrasive material shed excessively. After using a file I would find a pile of gray grit on the table but more importantly my fingernails were very dirty. The gray grit imbeds under my nails and is very difficult to remove. It requires a lot of soap water and a small brush. Maybe I got a bad batch since everyone else seems satisfied and this is not a problem someone could easily ignore. I only used 2 and threw the rest away.