20 black closed rings laser engraved year 25

Closed rings, 3mm and 2.5mm, numbered from 001 to 020 in sets of 20, in black, bearing the official year number (2025).
Engraved with the current year + diameter + bird number + country.
Numbered rings are useful for guaranteeing the age of your birds. Each ring has its own number.
Rings are sold in sets of 20.