One (1) Replacement Earring Back (Screwback type) for the following: 0.30 carat Solitaire Studs (0.60 carat Total) 0.35 carat Solitaire Studs (0.70 carat Total) 0.50 carat Solitaire Studs (1.00 carat Total) Dax Earrings (Pico/Nano/Micro) Davin Earrings (Nano/Micro) Elle Diamond Earrings (0.70 carat Total) Fortuna Earrings (Nano/Micro) These will not fit our 0.25 carat Solitaire Studs (0.50 carat Total). Those can be found here. Our earring backs are machine-pressed and of high-quality for the highest durability. Shipping for replacement parts are not included and may be charged separately depending on the region you require delivery to. Thank you for your understanding.