CleverDelights 30mm round flat glass tiles. Solid glass. 25 pack. Diameter: 30mm (1 3/16 inch). Tile thickness: 2.5mm (3/32"). Clear transparent tiles. Use these premium glass tiles with our matching CleverDelights 30mm (1 3/16 inch) round pendant trays to make beautiful custom jewelry. Both sides are flat. Please visit our store to see our full selection of CleverDelights round and square glass tiles, round and oval glass cabochons, and more! Thanks for shopping with us!