Just a bunch of different sizes and thickness.
It can always be a good idea to try playing different kind of peices with other types of picks. For myself I always gravitate towards small jazz picks that are thick, but should I play something needing a softer touch I might just switch to a big really soft pick.
This is why I bought this mix, just to try out some other playing styles and see what works and what doesn't.
It is worthwhile getting this bag of mixed picks just to get some experience with different kind of picks and toughness.
Happy with my purchase - and very low price.