<P> Drink coasters are also made from soapstone, metal, wood and silicone . </P> <P> Beermats are usually adorned with a customized image--usually mentioning or advertising a brand of beer, although they can also be used to promote a drinking establishment, sports franchise, businesses or special events . </P> <P> Some coasters are collectible items . Tegestology is a term coined from Latin (teges, - etis, "covering, mat") defined as the practice of collecting beermats or coasters, with practitioners known as tegestologists . A 1960 British Pathe News short shows comedy duo Morecambe and Wise as tegestologists . </P>

What is the average size of a drink coaster