Even if they do not maintain 13 years, I expect not for the price also. Actually, I have even more to receive than expected, because the brushes are very soft and most of all -> it does not "hair" and are very good in the hand.
Absolute buy recommendation for all who expect no Mac Brushes for money.
ADDENDUM:
Meanwhile, I have this set bought later as a gift yet 2x. 1. intensive brush cleaning without loss of hair were like new. As a hobby painter I ask myself honestly, how to produce and sell good-quality brush so for this price. Furthermore, absolute buy recommendation, just as a starter or supplementary set.