After import from Africa, each instrument is cleaned, inspected, tuned, and played individually to check sound and quality. Random low to high tuning, in keeping with use as a percussion instrument. Tuned close to C-C# Pentatonic. Heat dried keys to help maintain tonality and prevent cracking. Hand crafted in Africa by village cultural artisans supported by the non-profit Africa Heartwood Project . World Percussion USA is the only authorized seller of Africa Heartwood Project instruments on this marketplace. All other sellers of this item are NOT selling the product described in this listing!