Pick a claw that is as long as your bun or longer.
Most hair types do well with a regular sized 2-prong hairclaw (about 5.5-6" long).
For thick heavy hair I would recommend a 3/4-prong hairclaw. The extra prong gives more support for those big twists!
For thin silky hair I would also recommend a 3-prong hairclaw (probaly a shorter one (about 4-5" long) because it holds more hair in your twists allowing for a better hold for that hair that likes to slip out of things!
I also make little mini claws for half-ups, pigtails and for under hats.
If you would like a lightweight claw I can make a thinner one or if you have any other special requests just send me an email at email@example.com.