Completely handmade, crafted using the same processes as musical instruments. When metal is bent forcefully, stress accumulates, hindering resonance. Re:VIBRATION is completely handmade and undergoes annealing to equalize the molecular bonds of the metal, producing a stronger resonance. This is similar to the "〇〇 treatment" found in musical instrument stores, which improves sound. Similar to the difference between a factory-made instrument and one handcrafted by a skilled artisan, this process is labor-intensive but essential for resonance. YELLOW BRASS Uses brass, the same material as musical instruments. Enhances the bright and refreshing resonance characteristic of brass without any sense of incongruity. COPPER BRASS This model emphasizes the luster and harmony of sound, using 100% "copper," the characteristic material of gold brass. While the resistance is slightly stronger, the resonance produced by copper creates a very elegant tone. By using brass for the ring section, the load is minimized while maximizing the effect. The ring section can also be made of copper as a separate option. STARLING SILVER This model uses STARLING SILVER925, which is used in the silver material of many musical instruments. Silver produces directional resonance, creating a sound that resonates to the far corners of the hall. The ring section can be changed to brass or copper as a separate option.