Have used these Jim Dunlop plectra (plectrums - picks) for years. Great picks - don't slip out of your hand and get lost when on stage - it happens using other picks - why are so many of them smooth and shiny? Just beg to slip out of sweaty hands! These JD picks don't break easily either - never broken one of these but broken quite a few in nearly 40 years of guitar playing! Originally I used Herco Nylon picks (back in the '60's and '70's) which were similar but not seen them for years now. These are just as good and available in several different thicknesses to suit different styles. Don't see the reason for the proliferation of other picks on the market - all rubbish compared with these IMHO!
I am a beginner at the guitar and these are great picks to start off with i will recommend these and you get 10 picks which is a bonus if you end up losing a few.