The plastic or metal triangular picks are a peculiarly modern phenomenon.

Traditionally a pick was made from an eagle's quill. This tradition has developed into the modern Oud pick made from a plastic bottle. You choose a bottle of the desired thickness and cut a strip about half an inch wide and a good four inches long and point the end to your own requirements.

It is much easier to hold than one of those fiddly little ones that keep slipping in your fingers and the flexibility can be finely customized.

If you really need a metal one you can always cut one from a sheet of shim stock or phosphor bronze.