Are these the same as the red ones?
Anyway, these are great picks with good grip, flexibility and durability. I don't know how people use those celluloid numbers. I break them after 10 minutes of playing.
These 0,50 ones are perfect for strumming.It's a plastic nut which doesn't cost much and does the job. The string spacing (not the total width) appears to be just a hair wider than the stock nuts that are standard on Asian import instruments, which is a good thing in my opinion. Gives one just a little bit more room to finger complex chords without muffling adjacent strings.
In short, a perfectly-useable guitar part hardly distinguishable from more expensive equivalents.