Van Gogh mosaic tiles are cut from sheets of glass that are made from painted glue chip glass. The painted surface is then coated with a black backing similar to mirror backing. These tiles are perfect for mosaic and stained glass work where light will not shine through. The thickness is the same as standard art glass - 1/8". We recommend adhering these glass mosaic tiles with Weldbond or MAC glue. Not suitable for tumbling. Handmade in North Carolina. Since the glass is handmade, sheets may vary from photo. Add extra sparkle and depth to your project using Van Gogh mosaic tiles!