The hoops photographed are solid 14k yellow gold. Before purchasing you can choose which color gold you'd like, yellow, rose or white all solid 14k. The hoops are 17mm in diameter and have a push back closure. There is a bumper at the end of the hoop so you can hang charms from them without worrying about losing the charms.
Below is a link to 14k gold & diamond bars to hang from the hoops:
