Traditions' thunder nipple magnum ignition system assures you a torch-like flame to ignite the powder.It uses 8mm thread that tapers at the end to lock into the thunder dome breech plug.The model comes with a 209 adapter for use with 209 shotgun primers.It is recommended when using the 209 adapter, to use the magnum hammer.Type: NippleCaliber: Black Powder Shotgun w/Magnum 209 PrimerFinish: Stainless SteelColor: SilverMaterial: SteelModel: Thunder Nipple