Since it was 0.7 to 0.99 mmφ, I mainly wanted about 1 mm φ, so I bought it, but I purchased it so much, but there were not much bigger ones, there were many things like 0.8 mm φ or so, and I had a hard time choosing a bigger ball.
I rented a machine and needed an experiment within a limited time. I arrived immediately this time so it was very good. It seems that it was obtained somewhat cheaply when purchasing from the laboratory supplies agent. However, there is a high possibility that they could not be brought on the next day. This time it was necessary to hurry, besides the things that had been prepared beforehand since the rental machine arrived, so I purchased it here.