These picks are very, VERY cheaply made. They regularly break in half, bend, or chip off when I use them on anything heavier than 10's and definitely don't work out for playing on an acoustic or a bass. All that said, I really enjoy these picks for particular points of my music, namely when I want to have very light attack but still want to be very fast. I play progressive rock and alternate with two other guitar players between rhythm and leads, but I tend to a take a bulk of the long winded solos, and one would think these picks may not apply well to such parts. I've learned, however, that along with playing more tenderly overall, these picks reward a player who is willing to let the pick bounce around the strings. I can be incredibly fast with these picks, almost to the point of sounding like a mandolin player. So, while I can't call these my all usual preference, I am constantly picking these up when I want to be softer, faster, or play with less force overall. Be prepared to break plenty of these before you figure out your grip and speed, but luckily they're very affordable as well.