All acid tested. This product is a mixed lot of 925 sterling silver bead caps findings beads, weighing 45 grams. The bead caps are made of high-quality sterling silver, giving them a shiny and elegant appearance. They are perfect for jewelry making and craft projects, adding a touch of sophistication to any creation. Whether used in necklaces, bracelets, or earrings, these sterling silver bead caps are sure to enhance the beauty of any jewelry piece.