Size:Blade Length:4 Inch,Full Length:9 Inch.Convex nails to ensure smooth opening and closing, to extend the use lifecycle. Pure Copper Gaskets: anti-wear, good ductility, no rust FLIP WITH FUN: The trainer is so easy to use and safe flipping fun....

What's more cool is that watching an expert flip that blade around and seeing why it's called a butterfly? But learning to use a butterfly can be a dangerous and even painful experience. Now, here's your opportunity to learn to manipulate a...