Material: 17-4 Stainless Steel - Color: Black - Length: 0.03 - Pockets: Black Oxide - Choke Gauge: 28 - Choke Pattern Percentage: 45%-75% - Weight: 4.8 oz - Extends beyond the end of barrel for easy removal and installation - Stainless steel with black oxide finish - Laser-etched gold accent band - Minimum gap geometry plus high-resolution 'RMS' finish reduce plastic buildup in bore - Invector-Plus long taper choke tube technology in 12 and 20 gauge - 28 gauge and .410 bore are Standard Invector chokes