Black Cloud Choke, Improved Cylinder These chokes were specifically designed for the Federal Black Cloud line of shotshells. Made from high strength stainless steel, with an extended, knurled head and a black oxide finish to reduce glare. The interior of the choke has been modified for the Black Cloud ™ pellets to give optimum patterns of the proper density. They are manufactured in Improved Cylinder for close range, Modified for mid range and decoyed birds and Full for long range pass shooting. - Fits: Remington 12 Gauge - Extended