British (Inert) Baton-Round Cartridge Cases x 12. Grey.
Here we have a great collectors' item! Genuine 37mm cartridge cases, baton round.
This is for one pack of 12 units.
These also make for a great little desk caddy!
Equiv. cost per unit: £0.75
Note: The cartridge cases are totally inert (the plastic baton-round element has been fired / removed) and have zero ability to harm (under normal use).