The Sabian Xs20 were made from Sabian's B20 bronze. The same bronze they use in their top level models. These were meant to be student models, but it turns out they were WAY nicer than that, which might be one of the reasons they don't make them anymore. They were too good! Seriously, I would put these up against a Zildjian A or Sabian AA and be very pleased.

No issues.