Beautiful handmade bee coasters. Each coaster is approximately 10cmx10cm. Due to the coasters being made out of natural slate, the size, thickness and design of the coaster vary slightly. How to care for your handmade decoupage coasters: Do not dish wash nor submerge in water. Simply wipe the coasters over with a damp cloth and remember to handle with care! Though these are designed to be practical, they are also delicate due to the nature of the slate.