Enjoy these very diminutive sleeper hoops of 14K yellow gold. Once they're in, they usually stay put for a very long time. Great for resting pieces in multiples.
Measures 10-12mm range and the tube diameter is 1mm.
How to put them on is a skill:
-In front of a mirror (magnifying is great), gently open the hoop, twist and insert.
-Working from the front...realign the wired post to the tube and squeeze tight to close the space as you like. Mine are closed to 10mm for example.