That's actually just a blemish..the actual blades on set are foam rubber with aluminum bar insert. The rubber is painted silver and when poured, sometimes isn't all that smooth. I BELIEVE that the machete is actually just a cheap made in china machete that you would find in a flea market, and over the years different designs are seen...also thinking they may have taken one and then "TWEEKED" it..alot like Ruby's knife, so finding an EXACT machete may be impossible. It was used in season one and the props seem to get more HIGH DOLLAR and better name brands as the series progressed...:thumbsup