Korolia Viola-Violin Bridge Blank The various designations in the Korolia range are : Grandiose – Quality: Strong Medullary rays, very tight grain. Supreme – Quality: Tight grain with Medullary rays. Classic – Quality: Medullary rays less evident, wider grain. Economy – Slightly lower quality than Classic but still great for student type instruments It goes without saying that these blanks need to be shaped and prepared by a trained professional for the best results.