Jebs Choke Tubes 10 Gauge Remington High Voltage .690 Modified Waterfowl Choke Tube Black Nitride JPCBN - 10A2/690. The patented design gives the shooter a more consistent shot pattern a more distinctive & shortened shot-stream and incredible knock-down power for those much needed longer shots. Choke Tubes are offered in Ported as well as Non-Ported models. Specifications for Jebs Choke Tubes Black Nitride High Voltage Waterfowl Choke - 10 Gauge: Manufacturer: Jebs Choke Tubes Finish: Black Nitride Fabric/Material: 17-4 Heat Treated Stainless Steel Gauge: 10 Condition: New Features of Jebs Choke Tubes Black Nitride High Voltage Waterfowl Choke - 10 Gauge All tubes are made from 17-4 Stainless and heat treated to 44 Rockwell hardness to accommodate any type of shot SteelTungstunHevi-ShotLead or anything the shooter wants to shoot Package Contents: Jebs Choke Tubes Black Nitride High Voltage Waterfowl Choke - 10 Gauge Jebs Choke Tubes JPCBN - 10A2/690: 10 Gauge Remington High Voltage .690 Modified Waterfowl Choke Tube Black Nitride