Size: 6"x 4"x 1/8". Quality: FCS certified and 100% recycled wood source. Sustainable: We make them strong so that they will last in the mail (1/8” thick) and if would like to add your own personal touch… you can easily write a message with just a ball-point pen on the back. We use sustainable inks with a UV coating that protects the image so that it can be re-used as a coaster.