Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Counterfeit Blades

Ran out of my Mach 3's and finally got around to ordering some here after seeing the price at Walmart, etc. When I tried the first one I couldn't believe how badly it pulled the hair on my face. Figured they were bad. Well... just happened to find a couple blades I never used from my old case. Put one in and WHOA, what a difference. I got online and typed in "counterfeit razor blades". Check for yourself. Don't buy these. Shame on Amazon if they continue to allow this seller to use them.