Traditions Lightning Fire Musket Nipples For In-lines M6x1 Threads. Not for use with Thunder Dome Breech Plug. 2 per package. Specifications for Traditions Lightning Fire Musket Nipples For In-lines M6x1 Threads A1400: Mfg Item Num: A1400 Type: BLACK POWDER GUNS - ACCESSORIES - NIPPLES For: Traditions In-Line Muzzleloaders With M6x1 Threads Master Model Header: Lightning Fire System Musket Nipples The Traditions Lightning Fire Musket Nipples For In-lines M6x1 Threads A1400 is a quality addition to the Traditions lineup. For more great deals on Muzzleloading Supplies by Traditions please browse our Traditions Muzzleloading Supplies page.