Known under many names, butterflies have become one of the most popular knives to date. They consist of a blade with two handles that rotate around a pivot and wrap around the blade in the closed position. Trainers are becoming quite popular themselves as more and more people want to learn tricks. This trainer is exciting as you not only get to practice your moves but you can perfect a certain hairstyle for that bed head at the same time. Trainers are cool all on their own but just look at the handle. Each section of this handles is double walled. The inner wall consists of stainless steel with the outer wall containing decorative ABS mounts and steel. It complete with a safety lock at the end to lock your comb uptight.