Tambins, or Fula flutes, come in several keys; from E, up to Bb. The most common ones are F, F#, G, Ab and A. They produce one complete diatonic scale, starting on the lowest note of the second register (the 3rd of the scale) and going up three registers to the sixth of the scale. The first register is disconnected form the scale. These instruments are usually constructed from a conical vine from the forests of Guinea, the largest end being on the side of the embouchure and tapering down to where the fingerholes are. The bore can vary from 5/8" to one inch.