Those earrings are made with 3 different size of beads (8, 11 and 15). There is nothing inside them (no wooden ring, no metal ring or cotton wool...) what give them a shape what they have. It's just mine "clever" construction :). You don't have to buy all those things for those earrings. You can make them bigger or smaller without problem.
Size of the earrings: 4.4 cm diameter, and the inner circle is 2 cm diameter.
For those earrings you should know RAW (basic: to start, to do second, third row...). There is a little bit of peyote stitch and embellishment... Tutorial is available...