Manufactured from 17-4 heat treated stainless steel to withstand heavy buffered turkey shotshells. These choke tubes produce extra tight patterns with copperplated and buffered lead turkey shotshells. These chokes produce dense patterns and carry a lifetime warrenty. Each choke extends approximately 1 from the end of the barrel. They have a matte blue finish. These chokes should not be used with steel shot. We have found the .690 Extended Turkey Choke Tube to produce the most consistent patterns with turkey loads. Card shooters try the .675 constriction. Our Extended Turkey Choke Tubes feature a 1.050 parallel section to produce the optimum pattern with your shotgun.Fits all Mossberg Model 835 and UltraMag Shotguns