Owl Stud Earrings These Owl stud earrings are made of 925 Sterling Silver. The Owl is 9.9mm tall x 5.8mm wide . The posts are heavy duty and slightly longer than standard (.036/19 ga. x 7/16"L). Two types of 925 Sterling backs are included for preference or just to have a backup pair (Rubber core bullet style and traditional friction catch). Shipped in gift box.