Each one of these Tremolos has all Brass reeds. The double tremolo harmonica is a diatonic with the 32 lower hole reeds tuned slightly higher than the 32 upper hole reeds on each side. Since both reeds are either blow, or draw, when played both will sound together. So the slight difference in tuning creates a beautiful vibrating, or tremolo effect. That is why it is called a Tremolo. On one side is the key of "C". On the other side is the key of "G". 

Good with Ballads, and Gospel music. Because of this tremolo effect everyone who plays it can get a full, rich, beautiful sound. Even great for beginners! Color subject to availability.

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