1. Wide range: The 21-tone kalimba in the standard key of C has a rich range and has more room to play than the 15- and 17-tone kalimba, especially for some professional players. Most songs can be played in all 21 keys.2. Easy to learn and play: There are learning instructions in the package. Even if you have no knowledge of music theory, you can play simple music with simple study and practice.3. Ergonomic curved surface design: perfect balance of sound cavity, grip and appearance, suitable for playing, collecting and giving as gifts.4. Rich learning materials: With the popularity of thumb piano, there are many music scores and learning tutorials on the Internet, which can be found with a simple search. There is also some entry-level sheet music in the user manual that comes with the package.5. About adjustments: All products you receive are professionally adjusted. If you find pitch problems during use, please use a tuning hammer and tuning software to tune.Specification:Material: MahoganyKey material: Ore metal keySize: 14*3.4*18cm / 5.5*1.3*7 inchesColor: wood color, blueNumber of keys: 21 notesAlready adjusted before shipment. No complicated adjustments required upon arrival. Available upon arrival.Package includes:1* kalimba1*Cleaning cloth1*set of stickers1 * Tuning hammer