if your looking for a mechanical there has been on brand ive kept my eye on but never bought. i think i will next year. There called EPEK broadheads. They are a 3 blade piston driven expandable. But what i think the neat thing is is that you can lock the blades so they don't open when they hit a target and you can shoot your broadheads all year long. You will know exactly how they fly with out having to dull any.