Sterling Silver. Measure 3mm wide, 5mm deep, and ~23.5mm (~1 inch) outside diameter,  ~12grams. These are solid cast construction, with the catch built into the back half of the hoop. The wire through the ear is meant to be seen and will usually not snug up to your ear.

If you have ever been in a rowing shell and had the pleasure of adjusting the height of your own oarlock, or rig rowing boats, then you probably recognize these as the easy pop on/off washers.  They also happen to make funky hoops, so subtle, so stylish, anyone can wear them.

Clean them with baking soda or a .