A balisong trainer is a standard balisong / butterfly knife without a blade. It is 100 percent legal in the us and, unlike a knife, you can't cut yourself. The butterfly trainer will help you learn how to flip without getting injured but, note, you can develop bad habits if you stay on the trainer too long. For example, you can ingrain some poor flips that, with a trainer, won't hurt but, with a balisong, will hurt a lot. I recommend you to practice with a trainer until you feel confident enough to move onto the thing-no more, no less.Not everyone needs a practice butterfly knife. If you already own a balisong, you can just use some electrical tape to tape up the blade. This will protect your hands from getting cut. You can also just use this tip to skip the trainer and get yourself a well butterfly knife trainer.If you don't own a butterfly knife yet or if you are wondering if flipping is for you, get a trainer and try it out.Never rustThis enhanced butterfly trainer features a 5" unsharpened blade that is made of 440c stainless steel - it won't rust on you. It is 5.83 oz and for beginners to learn with. Lighter balisongs flip faster than heavier ones and require more agility.Specification:Overall length: 8.75"Blade(dull) length: 5"Handle material: 440c stainless steelWeight: 5.83ozLooking for the well butterfly knife trainer. " add " now, we a 12 month warranty