These are sold as single units!
THESE NEED TO BE OPEN AND CLOSED PROPERLY, CHECK OUT THIS LINK ON HOW TO OPEN/CLOSE!
https://youtu.be/hWFa4otDfiY
Some hoops only come in one size which will be listed below:
Material: 14kt Gold
Gauge: 18g
Diameter: 5/16 (8mm)
Stone: NA