French to English Tech/Engineering

"Les bordures de ces trottoirs sont constituées de blocs généralement de tuf volcanique ou de calcaire du Sarno, deux roches sensibles à l'usure, qui se creusent continuellement et déforment l'aspect des rues"

I have translated the above sentence as follows:

"The kerbs of these pavements are normally formed from blocks of volcanic tuff or Sarno limestone, which in being soft rocks, are continually worn down giving the streets an uneven appearance."

I have understood "sensible à l'usure" as referring to the fact that the pavement kerbs quickly wore down because they were built from these soft rocks. I would just like to know if anyone thinks my translation is accurate as I don't feel that "sentive to wear and tear" would sound right. Many thanks