made from black rhodium dipped sterling silver, these 4mm ball stud earrings are simple but definitely not boring! the ball stud is 4mm high, 3mm wide and 4mm deep and pin length is 11mm. stamped with the 925 metal mark, these earrings are secured with an andralok fastening. andralok fastenings have a hinge halfway down the post of the earring allowing them to click into place and stay there securely without having to worry about losing any pesky earring backs!