We have a set of 3 oak coasters that we did the fractal burn to and then added an Excalibur Blue color epoxy to the burn areas. Each coaster is 4" square and yes there is only 3 to the set.
As with many of the sets of coasters, when done using them, put them back into the pattern created by the burn and set them on top of a table or bar to display the piece of art.
Each coaster is finished with a food safe, wood preservative that will protect the coaster from any liquid that it may come in contact with.