They were made to look like cartridges. None of these are made from cartridge componants, unlike some of the keychain items or pens, etc… made from cartridge cases and such. Left item is a Chinese made “dummy cartridge” possibly for a key chain. All steel, brass and copper plated. This item was discussed here a while ago. Second item is a “punch cutter” for cigars. Brass plated steel and very heavy. The last item is a valve stem cover for auto/bicycle use, hollow aluminum, threaded inside. The yellow color is anodizing maybe and the “projectile” is simply the finish turned off to reveal the bare aluminum underneath. What do you guys have in this same theme?