The unsharpened blade of our practice butterfly knife will keep you away from danger as a beginner. This item is just for Practice usage. We calculate a perfect weight balance of the butterfly knife trainer and a perfect center of mass to make sure you can flip it smoothly. This trainer includes a durable tail latch for holding the knife open, or securely locking it closed. Ensure these knives are made to last.These are best gift for your friend if they are a butterfly knives lover; they can practice without harmful yourself. Just share these with your friends.