They measure approximately 1.25" (about 28-30mm). They are not uniformly round or exactly the same size (this can be seen in the pictures). The tiles are approximately 4mm thick.
The pieces you will receive are the ones in the photos...I don't ever use representative photos of my work.
The paper is adhered to the bottom of the glass, and then sealed to protect it from most adhesives.
I use these mostly for mosaics and pendants. They also make great focal points for mixed media collage and assemblage projects, and altered books.
When used as a mosaic tile, silicone glue is the best adhesive to use. Ceramic tile mastic also works well. I recommend sanded tile grout for finishing. These tiles should not be used with thin-set mortar when thin-set is the adhesive as well as the grout.
Please contact me with any questions. I make every effort to respond to all messages within 12 hours. Hope you are having a very nice day :)
I am happy to ship internationally--please send me a message that includes your country as well as what you might purchase and I will give you a quick shipping estimate.