Materials: Stainless Steel - Titanium - 18k GoldSizes,threaded: from 18ga to 00gathreadless: with 25ga pin.Anatometal Disk Ends are made out of solid stock material for internally threaded or threadless jewelry. Available with,18ga, 16ga, 14ga, 12ga: 3mm, 4mm and 3/16"10ga, 8ga: 3/16" and 6mm6ga: 7mm4ga: 5/16"2ga: 3/8"0ga: 7/16"00ga: 1/2"