I wouldn't sweat it. I'm sure Vulfix will take good care of you. I had purchased a brush awhile back and was losing hairs. It turned out that the manufacturer had used a bad batch of the epoxy resin used to cement the hair in the brush. As a replacement brush, Charles from QED, sent me his SR-241 (Vulfix 41 equivalent), and it is now my go to brush. And I have never, ever had any problems with this brush.
"Better to keep your mouth closed and appear a fool, then to open it and remove all doubt." --Mark Twain