Black German ink writes very smoothly!

I’ve been going through my new shipment of Generic Refills. I check one refill out of every bundle of two hundred to be sure that the quality is consistent. Every refill I’ve tried writes immediately and smoothly! The medium tips (1 mm) have especially smooth ink, this might be because they lay down more ink than the fine tips (0.8 mm). Don’t get me wrong, the fine tips are really smooth too! I’m so glad that my manufacturer’s production runs are just as good as the samples that he provided.