These are NAP heads. They are an improved version of the Thunderheads. I have these dating back to my Compound Bow days. I have two packs and am switching back to fixed heads next season and may give them a try.
Good penetration , but light blood trails,your experience may differ, my bow shot the 100 grain at 405 fps chronographed, I dropped my deer, but in my opinion the blood trail was sparse. My go to now and will stay with them are Grim Reaper whitetail 2 inch cut , never have seen such devastation in a broadhead, since entering the game in 2004. Still learning something new every season.Good luck.Make sure you sight in with a practice tip or the real arrow if you have a bag that will accept broadheads, fixed in my experience don't fly as well as a solid mechanical.