The starter mixture contained in the primer is responsible for initiating the burning of gunpowder at the time of shooting. CBC provides to refill cartridges central fire Boxer.
The Boxer primer is characterized by having an anvil mounted inside of the capsule containing the starter mixture. The anvil supports the firing pin of the weapon which compresses the capsule and crush the mixture, causing flames to pass through the event (small hole) in case of ammunition. Thus begins the burning of gunpowder. The Boxer primer type is mounted in the pocket of the Boxer type cases which have no anvil.