These knives are almost always one-piece rather than the traditional knives that have a handle manufactured separately from the blade. Its purpose is to create a durable knife with a balanced distribution of weight. Each thrower is perfectly balanced to assure uniform rotation when thrown properly. Easily attaches to your arms, wrists or ankles. Gungfu has a collection of ninja throwing knife, ninjitsu throwers and spikes at very affordable prices you can afford.