From what I understand it is designed to be used in the Nitrofire muzzleloader manufactured by Traditions. The FireStick is a plastic cartridge preloaded with federal's Triple 8 powder in solid form. Triple 8 is only available in their cartridge and of course is a black powder substitute. They come in 80, 100, and 120 grains equivalent charges.... You supply the 209 primer and the bullet.... They come in 10 packs and the best I can determine they are priced at roughly $3/3.50 a pop sans primer and projectile.
I'm like you, we need a report from someone who has one.