The Kushi butterfly knife from Azan has a cool "comb" blade. The stainless steel trainer-style blade has dull edges for the novice user looking to improve his/her flipper skills. In addition the blade has two tang pins, which means that the handles won't hit each other; lock-up is tighter and blade wear is reduced. The Kushi has good action and a light feel.
Note: Be sure to maintain all screws with loc-tite. These may come with slight imperfections, but make a fun knife.