Historically speaking. Protect your furniture while you travel through time and space! Derived from the super-popular Doctor Who sci-fi TV series, these beautiful, eye-catching coasters are made of laminated wood with a cork backing and felt pads on the bottom. They measure 4 1/4-inches in diameter. The set includes 8 coasters, each featuring a different Doctor Who logo from throughout the show"s epic 50-year history! Officially licensed.