Also, a lot of folks have gone to the micro diameter shafts, they say they get better penetration. Me personally, I use a larger diameter shaft. I think they hold up better to abuse. I use a two bladed broad head and have never had any penetration issues. I also feel like the larger diameter shaft transfers more energy and really helps open the wound cavity up. They use to say the larger the shaft the less stiffness you’ll have but I don’t find that true. Mine are always heavily spined for my setup so maybe that’s why.