18 gauge Faux Conch Piercing. 14mm in Diameter. You will need to tighten it so it doesn't easily fall off. You do not need a piercing to wear this.

Made from tarnish resistant Black colored brass wire 18 gauge.

If you are liking the matte studs in the picture you can view them here.
https://www.etsy.com/listing/190616147/4mm-tiny-matte-black-studs-and-matte?ref=shop_home_active_1&ga_search_query=4mm