What can really be said about Dunlop Delrin picks that hasn't been said already.
I go through picks like nothing else, they never break just slip down behind the sofa or fall into a black hole that obviously follows me around when I am playing bass.
These picks are what I have used since day one, nothing else feels the same for my hands. No matter if I buy 1 in a guitar shop or a gross bag to stock up they always feel perfect right out of the pack, perfectly uniform and never have any weak points.
If you play bass these are the picks I recommend above all others, they are just thick enough to get nice attack in the strings but not so thick you lose all sensation of the strings.
Plus being bright pink they are really, really easy to find when you drop them on a dark stage!
This Dunlap pick is in my opinion very good in the "heavy" class. What I like about it the most is that it produces a very clear sound (because of the smoothness), so nice crystal clear clean sounds are easily achievable. The durability is not as high as the standard Dunlap nylon picks. Highly recommended:-)