I just made one with a Dunlop thin plectrum covered with one layer of a J Cloth, it worked great on my Martin Acoustic for a bright but not too percussive sound.
The problem is after a few run throughs I had to re cover the thing.
I've searched Google but cant find any online, anybody know where they can be bought?
PS the felt covered ones for bass players are much too thick.
Woof!