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This generously sized nesting and stacking coaster is designed primarily for cold drinks and to help protect the surface of your table or desk from direct condensation. You may want to protect your coaster(s) with a spray lacquer or other coating prior to use to prevent stains or permanent discoloring with use.
Note that this coaster is designed to contain a properly sized cork or equivalent material disk insert in its bottom cavity which can be affixed in place with silicone glue. The cork disk will stick out slightly from the bottom of the coaster. The cork disks should be approximately 3.875 inches in diameter with a thickness of 0.25 inches. Properly sized cork disk inserts may be acquired from the following source: http://www.woodturnerscatalog.com/p/54/5252/Turners-Select-Cork-Coaster-Insert