This is my own design for the coaster. It is in the shape of Stargate with Iris. It is little bigger but that is because I prefer “Tuplák” - 1 liter glass of beer and it fits to this coaster really nicely. The Iris has holes in it to lead out the water from the condesation so that there is no water film in the coaster itself. There is also a cavity beneath into which you can place a standart paper coaster. That is to suck all the water and not leave the table wet. You do not have to use it if you do not like to.