Derhyme mass-produces the intermediate double bass. The double bass is the largest in the musical instrument. The sound is extremely deep and soft, and it can play extremely beautiful overtones. The plucking method can make a rumble, which is often just right to describe the sound of thunder or waves; slow the effect is best when playing and should not be played fast; the sound quality of the high-pitched part is delicate and moving. The double bass is huge and needs to be played standing up. It has two basic shapes: one belongs to the six-string violins family with flat shoulders and back; the other belongs to the violin family with square shoulders and slightly rounded backs. . Each beginner and intermediate double bass is carefully crafted by many years of skilled craftsmen. They are colorful, neat and tidy, exquisite workmanship, beautiful tones, and no noise.