The post length determines how much of the post extends through your piercing. Standard Length - 9mm post: Most common length, especially for younger lobes. Long Length - 11mm post: Provides an additional 2mm of length, giving you more room for thicker earlobes (typically more common on adults) or temporary swelling. The Fine Print: * Ouch-free and secure screw-back posts * Free from: Nickel, lead, and copper Earring Dimensions: * Post Length: 11mm * Post Size: 20 gauge, .8mm * Earring size: 9mm W x 6mm H