I've been using these picks on and off for about 5 years now.  I'm not a very good player, and it shows in my lack of knowledge on picks.  Since these picks don't show what their thickness is I guessed and went with the mediums.  Well, they're definitely thinner than the .73mm Dunlop Tortex picks, which I've mostly been using.  I recently went back to this gel pick and found that rhythm sounds much better with these, and the grip is slightly better as well.  I didn't realize how much the material and thickness of a pick impacted my tone, especially on electric guitar.

As far as the colors are concerned, I don't understand what all the fuss is over receiving a single color versus a variety.  It's quite clear that the colors correspond to the weight (thickness) of these picks.  Medium-light is green, medium is purple, extra-heavy is yellow.  Duh!
I've been using these picks on and off for about 5 years now. I'm not a very good player, and it shows in my lack of knowledge on picks. Since these picks don't show what their thickness is I guessed and went with the mediums. Well, they're definitely thinner than the. 73mm Dunlop Tortex picks, which I've mostly been using. I recently went back to this gel pick and found that rhythm sounds much better with these, and the grip is slightly better as well. I didn't realize how much the material and thickness of a pick impacted my tone, especially on electric guitar. As far as the colors are concerned, I don't understand what all the fuss is over receiving a single color versus a variety. It's quite clear that the colors correspond to the weight (thickness) of these picks. Medium-light is green, medium is purple, extra-heavy is yellow. Duh!