Pro Jewelry .925 Sterling Silver Core w/ Genuine Natural Agate Bead Quantity: 1 Bead Material: Natural Stone Beads : S925 Solid Sterling Silver (Stamped) Core: 4.5mm slide on (not threaded) Fits: All major Brand Bracelets, such as Pandora,Kay's , Troll, Chamilia, Carlo Biagi, Zable, and other add-a-bead bracelets.