Slick Tricks, is there really anything else!? All steel construction, how many heads can say that? Replaceable blades, but thick enough (.035) that blades can be resharpened. Four blades that interlock with each other, that unless you put them in a vise and hit them with a hammer, the blades will not come out, or move. A three pack is less money than most out there. I have shot these through dozens of bows that I set up and get great flight out of all of them. I do not have the worry when shooting at any animal whether the blades will deploy or not. The blades are german Solenger mfged, so they are razor sharp out of the package. I could go on but you get the picture, now get some st.