Most civilian percussion pistol, including arrrr Tiny Percussion Pistol, use either the No. 10 or No. 11 percussion caps. Military pistols, such as arrrr Prussian Military and Short Sea Service Pistol, as well as other muskets use the Musket Cap. Brands may be different from the photos as they change based on what we can get, but we find that they all be of good quality. A tin contains about 100 caps.