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No. 10 Percussion Caps are small, specialized ignition sources designed primarily for cap-and-ball black powder revolvers and pistols with smaller, tapered nipples, 100-count tin. These caps feature a non-corrosive, non-mercuric priming compound that delivers clean-burning, highly reliable ignition of black powder and modern synthetic substitutes. Because No. 10 caps have a slightly smaller internal diameter than standard No. 11 caps, they provide a snug friction-fit seal on the nipple, which prevents them from falling off during recoil and ensures the hammer strike efficiently crushes the priming compound for immediate detonation.