RB-234-G Rudolph double bass 3/4 RB-234-V Rudolph double bass 3/4 RB-634-G Rudolph double bass 3/4 RB-834-G Rudolph double bass 3/4 RB-834-V Rudolph double bass 3/4 MB-34-PY Schneider double bass 3/4 MB-34-ST Schneider double bass 3/4 MB-134-ASA Schneider double bass 3/4 LB-134 Leonardo Elementary series double bass 3/4