Howard Core Violin. Core-A15E-3ADJ, Core-A15E Violin, Adjusted and Ready to play. European wood. Size: 1/2. Violin outfit, including a 1/2 case, and a 1/2 violin bow. The star pupil of the Core Academy series, the all new A15 model has been wildly popular since its re-introduction and it's no surprise. This head of the class features a more transparent and aesthetically pleasing finish, allowing the natural wood grain and flaming to shine through. Hard work and careful study habits pay off with a pleasant tone, easy playability and quick response that will pass any test with flying colors.