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Inside diameter 11 mm at widest.
14mm x 13mm Hole size is approx. 1.3mm. Inside diameter (ID) is 11 mm. By the each.
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!