Extra Tiny Three CZ Internally Flat Back /Stud Earrings / Screw Back Earrings in Sterling Silver, Silver or Gold or Rose Gold, CZ Trio Stud Sold as a pair. Complete with sterling silver butterfly backs. Dimensions : 4 mm Flat Back (Internally Threaded): Post length is 8mm, 1.1mm thick (fits 16 gauge). Screw Backs (with balls): Post length is 6mm, 0.9mm thick (fits 18 gauge). Studs (with butterfly backs): Post length is 11mm, 0.7mm thick (fits 20 gauge) Materials and Care: These are made of sterling silver with the option of 18ct gold coating. Only precious metals are used and they are hypoallergenic. They are tarnish resistant but please keep in a sealed plastic bag when not wearing. Packaging: All our jewellery comes with our branded velvet bag so your item is ready to be gifted. Production Method: Small Batch lost wax casting. More details about our production method https://www.silverrainsilver.com/blogs/production-methods/production-method-1-lost-wax-casting Instagram: silver_rain_uk