These are NOT the cheap rubber or plastic knives from China, Korea, or India. They Have a Nylon core for a bit of "heft" and rigidity, allowing them to be "disarmed'. High quality and durable. With 1" of high density foam pads on the tip, You can stab the heck out of each other without causing blunt trauma injury!!!
Round knives have a 1 1/2 " diameter blade and a 1" handle. Flat Tip is the safest, but Tanto tip is cooler...