After 4 weeks for delivery, the part from China arrived. The holes are unsuitable for loose tea because that are too large. When one squeezes a teabag pure it works quite well, but I can also take the tea bag. It's more a gimmick because of the optics. Boiling water holds out the sieve and let's see how the plastic behaves in the long run.
Due to the coarse holes I have it now swim as activated charcoal filter in my aquarium.