I have several thumb picks, some all plastic and some all metal. The ProPik is the first I have tried that is both. Metal part fits precisely with some tweaking, doesn't slip and also not too tight. I can wear for hours without getting nub. Large size was larger than I expected, but fit my fat thumb well enough. I will try a medium some time later.
The picks are great ...... a little Pricey when you and shipping ..... would buy them again though.
Good price, good service
This thumbpick is a little shorter than the Dunlops that I'm used to, but it didn't take much time to adjust. It's lighter, less bulky, very comfortable on my thumb and sounds nice and clean. It's my new go-to thumbpick for banjo.