You can have a simple analogy that any metal with a deformed formation for making a weapon is sharpened and can be sharpened over time. The same is the case with the broadhead blades that are crafted from stainless steel. Therefore, if your crossbow broadheads of yours have lost their sharpness over time then you don't need to replace them, whereas you can sharpen them from time to time. Whereas you can sharpen your broadhead blades with commercial tools and with a wet stone as well. It all depends upon you and your efforts and skills for polishing your hunting skills and sharpening the broadhead blades.