25 mm shell casing . Not brass .
SHELL CASINGS – Artillery Works Co
25mm Ammo Box
25mm shell Dummy, Army Issue
U.S. MILITARY Empty Composite Case for 30 rounds of 25mm-Linked
Ammo 25mm M242 Bushmaster Dummy Round Fired Shell Casing With
Collectibles
U.S. Armed Forces 25mm Linked Ammo Can - Hero Outdoors
25mm Shell Casing
Army Uniform Buttons - Norway