I checked the D (re) string for a fold with pliers - it broke on the 5th fold. I did the same test with similar strings from another well-known company for the letter D' - it broke on the 7th fold. . It turned out that this is a Chinese fake (and what else to call it? ). The description doesn't say this. This is no good at all! I would never buy those strings!
The photos I added should give you a good idea of what to expect from this experience.