You Get What You Pay For
I bought these based on reviews. After years of owning pricey Czech glass files, I bought these to replace one I lost. After using these for a couple of  weeks, the quality, or lack thereof, began to show. It became almost smooth--and useless. Who cares if you get five if they go south in a matter of weeks. I ordered the genuine article, and immediately noticed the difference. I’m sure the replacement will last years unless I drop it on concrete.
Rating: 2 stars