Each of these hard enamel pins is 45 mm and this listing is for a grade pins they luckily all came out with no issues on them!

A grade - is for a perfect pin barely if any imperfection in the hard enamel
B grade - have some minor imperfections such as scratches/ knicks in the enamel/ low filling in the enamel/uneven or slightly tinged metal/no fill areas/ speckles of color in the wrong spots

Note that if you purchase a b-grade pin then you understand there will be flaws present in the enamel pin you receive.
These are all still usable though and the imperfection may not even be noticeable!

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