CleverDelights 18mm round flat glass tiles. Solid glass. 50 pack. Diameter: 18mm (11/16"). Tile thickness: 3mm (1/8"). Clear transparent tiles. Both sides are flat. Don't be let down by cheap glass tiles that arrive chipped and cloudy, choose our CleverDelights premium glass tiles for excellent quality glass pieces. 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!