Incredibly accurate renderings of four familiar Philadelphia manhole covers etched in cork here in Philadelphia at NextFab. Super sturdy, 1/4 inch thick, four inches in diameter. You'll receive one of each design (sorry, no mixing and matching).
Created by Jason Lempieri, a contributor to the Hidden City Daily and founder of RethinkTANK, these coasters are an offshoot of his Under Cover series–a collection of functional miniature manholes from around the world.
The very definition of a conversation piece!