The PIRASTRO OLIV D string for viola is available gold / aluminium wound as well as silver wound and in the following gauges:
D gold/aluminium:
D silver:
The pre-chosen gauge for silver wound is medium, for gold/aluminium 16 1/4 is medium (1 Pirastro Maß = 1PM = 0,05mm). Per 1/4 PM the tension alters by 3%.