DIFFERENCE BETWEEN MOUTHPIECES:Size and appearance are the same, and 7C is the most labor-saving, 3C sound is wider. 7C has minimum tone, followed by 5C, 3C.The small tone is effortless, so it is best for beginners. BRASS MATERIAL:Trumpet mouthpiece is made of high-quality brass material with strong wear-resistant, corrosion-resistant performance. THREE OPTIONS:There are three models to choose 3C, 5C and 7C. 7C IS THE MOST COMMONLY USED FOR BEGINNERS:7C has minimum tone, and the small tone is effortless, so it is best for beginners. 3C SOUND IS WIDER:3C is loud via large air consumption, easy for the bass, somewhat difficult for the treble, so 3c is the most commonly used
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