Protect your furniture from stains with our trendy Custom Initial Lined Round Cork Coasters, which also doubles as fun a decoration for your dinner party! Personalize with any initial of choice. The coasters are made from natural cork. Cork is a natural thermal insulator. Cork's natural properties resist mold and mildew and are hypo-allergenic. Each round cork coaster is 1/4" x 4". Round Corks are eco-friendly as no trees were cut down in the production of cork.