BlankSlate Coasters Suck. What really sets BlankSlate Coasters apart from any other absorbent stone coaster on the market is how quickly and completely a BlankSlate Coaster absorbs liquid. BlankSlate Coasters are the most absorbent stone coasters in the world. Manufactured in Stillwater OK makes BlankSlate Coasters proud to be made in the USA. BlankSlate Coasters are made from a select blend of natural materials and a special manufacturing process which give them their exceptional absorbing abilities. Designed for both function and durability, we guarantee that these unique stone coasters will provide you with many years of reliable use.