READ BOTTOM STATEMENT ON SIZES Card Shooters - this is the ultimate choke for card shooting. Precision made of stainless steel for durability, not soft steel like many others... 8 grooves with up to 5 wad stoppers depending on the size (12 ga only) from .635 to .680. Choice of ONE size. This is a SPECIALITY item for the serious card shooters...So, NO..returns, I will give advise on choke sizes! However my advise is not a guarantee that yo will win or have the tightest pattern your gun can shoot it is nearly a starting point, just because Bubba’s gun shoots one way with one size choke doesn’t mean your will too. All guns, barrels and chokes shoot differently.