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Open back frame. Fill with resin, polymer clay, etc. Or bead it.OD:16.5 x 12.7 x 2.5mm ID:top section: 10 x 7.5mm, bottom section: 9 x 2mm
Made in U.S.A.. 13mm x 17mm x 3mm Hole size is approx. 2mm (loop). By the pack of 2.