Low-cost butterfly knife makes a great user or practice knife They are super cheap and quite reliable- the rivets won't fly apart). Green
finished aluminum handles (skeletonized for weight reduction), stainless blade w/ a high polish finish. The latch on this model is not designed to lock the knife in the closed position- it merely keeps the handles from separating in your pocket.
Training tip: put electrical tape over the edge of the blade while you're learning to swing and whirl your way to fame and fortune- no edge, no blood ;)