The Carlson's 12 Gauge Choke Tubes for Sporting Clay are perfect for shooters whose shot patterns need to be in a tighter grouping. These Choke Tubes manufactured by Carlson's Choke Tubes are made with a durable 17-4 stainless steel, to ensure that your Shotgun Choke will remain effective for many years.The Carlson's Sporting Clay Choke Tubes are able to throw more consistent patterns than conventional choke tubes because of the parallel section that is 25% longer than previous models.