All the Pro Series Mechanicals are compound approved for any set-up. They feature the New PRO TIP and “Snap Cup” design which holds all components in place for easy installation on your arrows. Super strong, razor sharp .035 stainless blades. No O rings , bands, or clips. Blades stay closed out of the fastest bows yet open smoothly on impact! The Super Killer, 3 bladed, 2” Whitetail Special for massive devastation and the quickest “Watch ‘em Drop” ever!