A guy that lives in my town came up with those broadheads, razorrings, he sold the patton a few years ago. There were issues with them not being consistent all the time when shooting. But i will tell you one thing, my best friend used them exclusively for a long time and Stan the inventor used themfor bear. I dont know of any other broadhead out there that leaves a blood trail like that. Stan limited himself to broadside shots, it was amazing the chunk they would take out. And my buddy put down countless deer with them.