Wood

Back with ribs for viola 1st quality

Back with ribs for guitar maple

Back with ribs for cello 3rd quality

Back with ribs for cello 2nd quality

Back with ribs for cello 1st quality

Back with ribs for bass plane 3rd quality

Back with ribs for bass plane 2nd quality

Back with ribs for bass arched 3rd quality

Back with ribs for bass arched 2nd quality