Avarez Brand Cumbus Tambur String Set CMBTS. Avarez brand AS-500 string set for the Tambur Cumbus. Contains six 58 inch long strings in three envelopes. Envelope one contains two steel strings with .012 inch gage. Envelope two contains two wound steel strings with .023 inch gage. Envelope three contains one steel with .012 inch gage and one wound steel string with .032 inch gage. For Re LA RE or D A D tuning.