This is a great skill set to acquire for self-defense and if you find yourself in a survival situation. You can even improvise this weapon with a pocket knife and shoelaces! I use a throwing knife in the video, nothing special at all, and have a 20-feet of 550 cord attached to the knife. The crazy part about mastering this weapon is you extend the range of “just a knife” out to 20-feet and hit a target. Next, you can retract the weapon for another throw quickly! Again, money-back guarantee if you are not completely satisfied with the video lesson!