These earrings are all on posts. This is great for stability and coverage of the earlobe. They are all sterling with a variety of stones and metals including 18K/14K gold, copper and bronzes. Stones shown here are Pyrite , Coral and in Tr-Metal. The earrings measure approximately the size of a penny and the average length is approximately two inches.They can be made to any length desired as the dangles vary and can be customized.