The top two photos show an
African blackwood Rover in
soprano D.  Below is the same
whistle in bocote, also known as
Mexican rosewood.
Above, you can see a complete set of
Rovers in the keys of C, D and E flat.  
They are made from Bolivian rosewood.

To the left, on my oiling rack, at the
front are Rovers in purpleheart and
snakewood. Behind you can see African
blackwood and osage orange.