They are Magnum II's. I still use them some, and took a 6pt.whitetail last season with one. The manufacturer went out of business in the late 80's or 1990. I bought a couple dozen at that time including the wider Magnum I's. I always used the truangle file and hone to sharpen them scary, wicked sharp. I had an opportunity to buy the tooling back then and didn't. I have heard of a few failures with these, but personally believe this may have involved improperly heat treated heads. I've put a few of them through some serious bone and never had a problem. CKruse