seriously ... my guitar teacher used to have a marble one. i used a graphite one (coated with nylon). I prefer pretty thick picks. so, why not ask about mikael's picks?
These picks must be famous or something because my bro just got some of these with the advise of other guitar players saying shit like "They'll make you sound so good" or something to that effect. I've tried them out for a bit, I just like the fact that their a thick gauge.