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Inside diameter is 11.5, and decreasing, so I think a 10 mm bead would look nice and fit inside, without disappearing.
13mm x 5mm Inside diameter (ID) is 11.5 mm. By the pack of 2.
Most of our copper beads and findings are copper-plated brass. They have a non-tarnish coating, and do not go green with wear. They do not need cleaning and should never be cleaned with an abrasive cleaner or solvents, as this will remove the coating.
Some people swear by the healing properties of copper. Here, we feel that any pretty thing that makes you happy has the power to heal!