They measure approximately 5.9mm by 10.1mm in size.
A good size for a bracelet or necklace.
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 Gold in total.