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Thank You. At least earplugs can reduce the noise when tapping the letters/numbers on the washer.
I didn't bother adding this as the noise when stamping the washers wasn't very annoying.
For some people, they may not need earplugs, especially those who are used to sounds such as factory machines or others.
I use these earplugs because when I stamp the washer with quite a lot of letters & numbers, it disturbs my hearing a little.
And its use is also inspired by the following Cryptotag tutorial video:
https://www.youtube.com/watch?v=EKgeItLZL-M.
(The Cryptotag Thor starter kit even includes earplugs in the box content packaging:
https://cryptotag.io/products/thor-starter-kit/).