Item Type: 28 Hole Polyphonic C Key Harmonica Material: Stainless Steel, Resin, Copper, Plastic Product Total Length: Approx. 21cm / 8.3in Package List 1 x Harmonica 1 x Wipe 1 x Storage Box 1 x User Manual 1Double Row Nozzle Design: The Double row nozzle design can effectively control the airflow and make the sound more full and layered. 2Plywood Design: Plywood design, stable structure, multi point support, strong air tightness, richer sound, stable structure and strong air tightness. 3Resin Material: The resin material has a clear texture and a comfortable feel, which is more convenient to use during the performance. 4Good Conduction Effect: The plywood design base is different from the traditional mosaic design, the metal conduction music effect is better, crisp and distant. 5Firm Structure: The harmonica is fixed with 13 screws and 2 screws for fixing the cover, which makes the whole structure more firm and ensures the airtightness of the harmonica.