Andoer 2-in-1 Tremolo Harmonica Mouth Organ Dural Key of C&G 24 Double Holes with 48 Reeds Free Reed Wind Instrument with Padded Box Cleaning Cloth 2-in-1 (dual-sided)design, key of C & D. Each side has 24 holes and 48 reeds. Cover is made of chrome-plating copper, good durability. Reed and plate are made of copper, come out with a pretty good sound. Comes with a padded box and a piece of cloth to keep harmonica safe and clean.