Landlord, this ball is very good, Audi KK bearing. Moreover, the upper line is wide, the wheelbase is medium, and the butterfly shape is widened. Metal shell, standard cue ball. Better than a headwind. As for whether it is imitated or not, it remains to be seen, because I can't find the ball Sirus at all on the internet. 10 is fast, some are all made of iron, which is not bad, but the bearings are not as good as Audi's.