Carlson's Choke Tubes Sporting Clays Choke Tube Fabarm Exis HP 12 gauge Extra Full Stainless. These choke tubes feature a constriction designed to produce the optimum amount of back pressure to achieve the optimum amount of back pressure against the slug or lead core without blow-back. These choke tubes extend approximately 12'' from the end of the barrel. Because of the distinctive pattern these chokes produce the tightest pattern with the least amount of flyers resulting in the leukemic effect of non-steel choke tubes. These choke tubes are machined from 17-4 stainless steel have a black anodized finish and come with a matte black finish. Specifications for Carlson's Choke Tubes Fabarm Exis HP 12 gauge Sporting Clays Choke Tube: Manufacturer: Carlson's Choke Tubes Fabric/Material: 17-4 Stainless Steel Gauge: 12 Choke Tube System: Fabarm Exis HP Choke Gun Make: FABARM Quantity: 1 Additional Features: Non-Ported Included Accessories: Choke Wrench Condition: New Country of Origin: USA Features of Carlson's Choke Tubes Fabarm Exis HP 12 gauge Sporting Clays Choke Tube Fabarm Exis HP 12ga Sporting Clay Cylinder Package Contents: Carlson's Choke Tubes Fabarm Exis HP 12 gauge Sporting Clays Choke Tube wrench Carlson's Choke Tubes 17608: Sporting Clays Choke Tube Fabarm Exis HP 12 gauge Extra Full Stainless