It is not a common mug.It is special that it changes color when hot moistre poured into it.Something disappears and something else appears. To companies,it is a perfect advertising product,helping to promote your business.You can imagine the result that when people surprisingly see your logo turn on the mug when drinking,of course they will remember your logo and your company deeply,and win more and more support. To organizations,it is an excellent item for usage of in memory of heros or figures,placing common effect on advertising the spirit of figures which do good to society,at a very low price.