The coasters are made from natural authentic cork. Size measure about 4" in diameter. Suitable for most of glasses, mugs, cups and bottles. The cork coaster always absorb drips, spills & condensation to protect your furniture, tabletops & counter tops.Also eliminate the disturbing noise from the contact between glassware and tables. These coaster is a great gift for housewarmings, birthdays, weddings, holidays. Specification: Material: Cork Size: 10.2x10.2x0.8cm/4.02x4.02x0.31inch Package Includes: 8 Pack of Cork Coasters 1 Piece Metal Holder Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!