This exceptional tube extends beyond the end of the barrel for easy removal and installation. They are tough with their stainless steel construction with black oxide finish and laser-etched gold accent band. Details - Minimum gap geometry plus high-resolution "RMS" finish reduce plastic buildup in bore, Invector-Plus long taper choke tube technology in 12 gauge, Material 17-4 Stainless Steel, Color Black, Pockets Black Oxide, Choke Gauge 12, Choke Pattern Percentage 15%-45%