Sporting Clay chokes are made from 1704 stainless and precision machined to produce a choke tube that patterns better than standard choke tubes. These choke tubes feature a 25% larger parallel section in the choke thus throwing more consistent patterns than conventional choke tubes. Lead, Copperplated, Nickel, Hevi-Shot, Bismuth, tungsten or steel shot may be sued in these choke tubes. Each choke tube is knurled on the end to allow for quick and easy removal. Each choke tube has the constriction laser marked on the end for easy reference. For best results, pattern your choke tube with the specific shotshell load you will be using in the field. Different brands of ammunition pattern differently from the same choke tube. HIGH-QUALITY MANUFACTURED: Our high quality Sporting Clays for Beretta Benelli Mobil is made of high quality Stainless Steel. Our Sporting Clays Choke Tubes are made from 17-4 stainless and precision machined to produce a choke tube that patterns better than standard choke tubes. HIGH PERFORMANCE: Carlson's Choke Tubes Sporting Clays for Beretta Benelli Mobil 12 Gauge constricted at Modified and measured at 0.705 diameter. LIFETIME WARRANTY: We back all of our choke tubes with our lifetime warranty so you can focus on busting clays and filling bag limits. MADE IN THE USA: All our Carlson's Choke Tubes are made, right here, in the United States. 30 YEARS WORTH OF PATTERNS: No other company like ours at Carlson's Choke Tubes with 30 plus years of experienced patterning and testing data, by analyzed thousands of load and choke combos with our proprietary software. We bring you the best and most accurate aim choke tubes for your hunting needs.