color: silver material: aluminium surface: smooth special feature: steel spring available in caliber: .12, .16, .20, .28, .410 packing unit: 1 pc LUPUS® snap cap with steel spring for shotguns in several calibers. The silver color makes it immediately obvious that it is a practice cartridge. The primer contains a steel spring to protect the firing pin. In addition, you can practise safely how to rectify a malfunction of the weapon/ammunition.
