Sold Individually. Add your own personal touch to this 925/10 silver-filled 8mm glue-on earring post to give it a personal touch. The flat silver post makes attaching your favorite flatbacks or other crystals simple, and the sterling silver material will complement any pattern or palette nicely. Our 925/10 silver-filled products are comprised of 10% silver, significantly higher than 925/20 silver-filled products, which only contain 5% silver. The silver is mechanically bonded to a brass core for a sturdy structure which allows you to create incredible pieces that have that perfect professional look.