Carlson's tss turkey choke tubes are optimized for federal premium heavyweight tss turkey loads but also work well with other manufacturer's turkey ammunition (smaller shot size 7-9).The federal premium's heavyweight tss turkey load has a high pellet count in both 7 and 9 shot, along with the ability to carry energy further, makes them ideal for 12 and 20 ga.Shells will include the flitecontrol flex wad that gives hunters the ability to shoot any choke tube they prefer.Gauge: 20 GaugeConstrictiondiameter: .555Chokes Included: One ChokeMaterial: 17-4 Stainless Steel