The Classic Short Range tube will extend out the end of your barrel about 3/8” (9.5mm) and has an effective range of 15 to 40 yards (13 to 36 meters). You will see a pattern similar to an Improved Cylinder choke on paper, but because of the patented “stud ring” inside the tube, there is a much shorter shot string. This shorter shot string will allow more shot to hit the target all at once so your down range energy is sure to kill instead of cripple. Our short range tubes can be used with Lead as well as Tungsten, Bismuth, Steel, and other non-toxic shot , 2 ¾” (70mm), 3” (76mm), and 3 ½” (89mm) shells, they come in Black only and are non-ported.