Thomann GuZheng Picks DCX 8pcs L

Bigger and more robust than the thinner, flatter picks that came with the Guzheng. Feels better to play with :)

About 2.6 cm long (fingers, not thumb), 2-ish mm thick (which I believe is about the size you want unless you're a kid). Concave on one side, convex on the other. The convex indent makes putting the picks on more intuitive, and easier to tell about how far in on the finger to tape the pick.

Also, the box is the perfect size for holding old credit cards on which you can store your tape + nails between practice sessions!