The Standard Invector tubes, designed by Browning, cater to a variety of needs with constriction options ranging from Cylinder to Extra-Full. These tubes are tailored to produce superior patterns featured with excellent uniform densities. Each tube adheres to industry-wide constriction standards. The design aims for a sleek, flush fit that remains within the bounds of the barrel's end. Made with highly polished 17-4 stainless steel, these tubes promise ultimate performance combined with long-lasting durability.