Technological craftsmanship that protects your instrument and your back forever. Why this design? The rhombuses grow, inspired by nature, and their edges make the structure more robust. ou may find the closure profile strange at first. It is not a hard profile, but a blue rubber of hermetic seal ‘tupper effect’. Rubber can be colored, and resists the passage of time and changes in temperature and humidity. The adaptable cushions and pockets allow you to carry different violins, sheet music and any type of bow.