I bought the Thomann octave mandolin and bought these as spare strings. On a side note, I'm not sure if they actually use the very same strings on these Thomann brand instruments they sell, but it sounded pretty much identical before and after first string change - good.
They sound good and I never broke a string before I changed them to freshen up, months on end. But from my experience, the mandolin family tends to destroy picks and not strings :)