I am very satisfied with the recycled glass pieces that I bought to use as coasters for both hot and cold items. Other coasters I have tried would always allow liquid to sit in the coaster and when I would pick up my glass, the coaster would be stuck to the bottom of the glass. Additionally, since I drink a lot of hot coffee, the heat would penetrate through the coasters and the wood on my tables was being ruined. My new coasters have remedied these problems.