Bamboo whisk makes whisking matcha easy and doesn't put scratch marks on your fine glasses. However, if you don't have a matcha whisk you can use a regular small metal or silicon whisk too. A small electric milk frother can also be used. Instead of using a metal whisk in your finest glass, use any regular small daily-use bowl to whisk matcha and water. Then transfer it to the main serving glass. I have always used a small metal whisk to make my matcha tea and never faced any issues.