They measure approximately 18mm up the shaft, and 13mm high from loop to top of the curve.
The shaft is 22 gauge.
There is a hammered detail on the curve, as shown. It has a mirror finish.
The loop is split at one point to open it out to accept a wrapped wire loop or other ornamentation.
Gold-filled is not a plating, but rather a layer of 14K gold that is mechanically bonded to a base metal under intense pressure (in this case brass). It is a many, many times thicker than a dipping, or plating, and will not 'rub off', or wear through.
A nice, ecconimical addition to your beautiful project.
Made in America, these findings have a minimum of 5% of actual 14K in total.