Coasters are very common in our daily lives. We often see them in the households and restaurants. But do we really know coasters? Besides preventing droplets messing up the table, coasters have a lot of other usages! For example, for advertisements or even for games! Nowadays, there are more types of coasters for us to choose, from different materials to different styles. Depend on our usages, each coaster has its pros and cons. It is also important to know how to clean each type of coaster to prolong its lifespan.