While individually these coasters might not look like much, combined the tardis coaster set creates the phone booth time machine from Doctor Who. There is no shortage of merchandise celebrating the long-running British television show, but these ones also add a puzzle-like element to your conventional coasters.
One thing the British hate is being rude, and you certainly wouldn't want to be in an awkward situation caused by your cup's condensation ruining your host's wood table or similar surface. That is where the tardis coaster set comes in. While it can't actually take you back in time, it can make you look cool. It also makes a great conversation piece if you are the one entertaining and want to bond with your Whovian guests.