D'Addario Shell Finger Pick, Medium 4CSH4, One Pick

They are too thin for playing a vihuela (mariachi).They’re also a little narrow.I thought they were at least a little thick. I don’t feel confident playing with these.Maybe only for practicing.

The guitar picks and quality of customer service really are top notch! Very much appreciated.

Though I haven't had a chance to try them out, the Planet Wave finger picks that I recently purchased seem to be of good quality; maybe more durable than the Ernie Ball brand. I will let you know after I have actually tried them.