Me and picks don't get along very well. They always slip out of my fingers, rotate etc..
Not these. However, I think I'd be buying thicker ones of these. I judged the thickness I was comfortable with of a couple of tortoise picks I have, which were 0.73. Tortoise is not as flexible though so when these arrived they felt a bit too soft for my liking. A Dunlop Max Grip of 1.0 would probably suit me better, but that's personal. Try them out. I don't think these will slip out of your grasp as easy as others, and if that's what you suffer from, then these are probably a good bet.