These coasters are made out of travertine and tumbled marble tiles.  They are either decorated using a stamp method and then colored in with chalk or are done using a gel transfer process.  The ink and chalk are heat set, then sprayed with a sealer for long wear.  The gel transfer method is done to apply patterns of decorative papers and then the whole piece is covered in epoxy resin for a nice, durable surface.  The bottom of each tile is covered in cork to protect  your furniture. 
****NOT DISHWASHER SAFE!  To clean, simply wipe them down with a damp cloth.****

**The epoxy covered coasters are one of a kind (there is only one of each) and can not be replicated.  The stamped coasters can be ordered in different colors and in multiple sets.