The Moa (extinct native bird, a bit like an ostrich) is a handcrafted low-whistle in the key of Eb major, almost an octave lower than D whistles like the Clarke or Feadog. These whistles are tough, made from PVC. They feature a small bell/horn which helps improve the volume of the lower notes of each octave octave compared to the higher notes. They also have a curved lip against which the air is directed like a classical flute, rather than a straight one, giving a more distinctive tone. Each whistle is carefully hand tuned to concert pitch A=440Hz, within the limits of variable air temperature and how hard you blow. Range is two octaves, Eb4 to D5, and maybe a couple of notes higher although they are rather loud! Besides the key of Eb, the whistle is easily played in Dorian mode (the scale starting on F), in Ab by half-holing the D and of course Cm. My whistle has a very comfortable mouthpiece shape compared to most PVC or aluminium whistles and all feature the Takahe emblem of my Takahe Flutes brand. They are shipped in a triangular package which is very strong. You can see a demo of the almost identical Low-D Ruru whistle on YouTube here.