I hope this video will help you to distinguish the fake Thomastik Dominant strings from China/Hong Kong and the real ones from reputable music stores. Both were bought from Ebay for about the same price of around $40 each.
The strings look identical; hence, I did not show the strings. But after using both strings for 1 month, the fake strings did not hold up and even the A string broken and the G string sounded horrible.
![](https://i.ytimg.com/vi/r43DxMLjjIw/maxresdefault.jpg)