One of the most essential tools for enjoying matcha is the chasen, a whisk made of bamboo that helps you to separate any clumps of powder. Making a thick koicha, a paste like consistency enjoyed with the highest grades of matcha, becomes easier with a chasen. The whisk allows you to create the froth of thin usucha (what is most commonly promoted as a matcha drink).
Notes: Most chasen are actually made in China now, with only a handful of craftsmen in Japan making only very high quality chasen. The higher the prong number, the easier it is to make froth but anything written "80" and higher is not actually an exact number. Use a lower numbered chasen to show off your whisking skill.