Check the listing for details. BLACK OXIDE BRILEY HELIX PORTED BERETTA BENELLI MOBIL CHOKE TUBE CHOICE. Condition: New. Listed at 85.51 USD. New Briley Black Oxide Spectrum Ported Helix Choke Tube for 12 Gauge Mobil.Special angled lateral ports impart spin on the shot charge as it passes through the choke, resulting in select core pellets migrating to the outer portion of the pattern. The result? More even pellet distribution, pattern-wide.All Helix chokes come with Briley’s exclusive Spectrum color band identification system.Lead shot only.Total length is 4-1/16" (so you can tell which case they will fit in).CHECK THE PICTURE TO MAKE SURE YOU KNOW YOUR CHOKE SYSTEM BEFORE ORDERING, NOT RESPONSIBLE FOR WRONG CHOKES ORDERED OR DAMAGES TO GUN! RETURNS--Due to the abuse of the eBay automatic return system, we will handle returns directly. If you need to return an item, contact us to arrange it. Depending on the reason for the return, the original shipping cost may not be refunded.