Well, they are XX75's- they should be pretty tough. With alu. shafts the wall thickness plays a big role in determining durablility. 2013's and 1916's spine about the same, but 6 1916's will last me longer than a dozen 2013's. Funny to think the extra .003 makes such a difference. If you can still get them, those old 2020 shafts used to last FOREVER! A friend had a set in two tone colours- the front half was silver where the anodizing had worn away. And they were probably still good for 'nother coupla decades!