Derived from the super-popular Doctor Who sci-fi TV series, these beautiful, eye-catching coasters are made of wood, have cork on the bottom, and measure 4 1/4-inches tall x 4 1/4-inches wide.

Any time you have furniture made from wood, you end up having to worry about moisture rings if you drink from cylindrical vessels with flat bottoms, no matter what time (or space) you're from. And The Doctor has so many hidden bits in the TARDIS, we know that even if we don't see it, he's got wood furniture in there somewhere.