Traditional Culture Encyclopedia - Hotel accommodation - What is this? What is the use of softness?

What is this? What is the use of softness?

Generally used in restaurants, cafes, hotels and other public eating places, can be used as advertising accessories to improve the image. Colored plastic coasters with company and enterprise logos are more prominent and closer to people's lives. Strong friction prevents glass and porcelain cups from slipping. It can also protect the desktop from being burned.