Factory Browning Standard Invector 16 Gauge Modified Choke Tube - 1130274p Produces excellent patterns with excellent uniform densities. All Browning tubes are set to industry constriction standards. Constructed of highly polished, 17-4 stainless steel for the ultimate in performance and durability Specs:br Material: 17-4 Stainless Steelbr Pockets: Stainlessbr Choke Gauge: 28br Choke Pattern Percentage: 35%- 65%br Choke Notches: 3br Weight: 4.8 Ouncesp This is a manufacturer's picture, so the item may not be exactly as it appears in the picture.