Hi,
I have never heard of Langka?
I have never heard of bamboo being used for a guitar either?
How is that done? Bamboo is hollow. Do they take a piece and steam it, to flatten it, or something?
Lignum Vitae was popular hundreds of years ago.
It was used for the 'block&tackle' and other rigging
on tall ships.
It has been used for propeller shaft bearings on modern Navy ships. It is still in use as bearings for the giant
generators on some hydroelectric operations.
It's basically a nightmare to work with..
but if you can make something with it,
it can be really magnificent.
The picks are $10 - $14 dollars.
It's a hard item to market, because we are so conditioned
to thinking of picks as a 50 cent item.
Such an important part of our sound deserves more
consideration than that though, in my opinion.
I was using a lot of different exotic woods,
making pens and knives.. when I became enamored
with the Lignum Vitae. I wondered how it might work
as a guitar pick.. and I liked the results.
I tried selling a few, to see what others thought of them
and people have kept me at it, ever since.