Bling Jewelry Set of Six Bundle Green Simulated Murano glass Lampwork Bead Charm .925 Sterling Silver From white, to blue, to simulated Onyx, this set of blue themed beads is clad in festive designs and patters, around a 4mm unthreaded sterling silver core, perfect for you bead story. 100% safe for sensitive skin. Copper and allergy free. Material: .925 Sterling Silver, Murano glass Lampwork Measure: 4 mm Bead Core Compatible with Pandora Charms, Biagi, Troll, Chamilia, European Style, Persona, Ohm, Kay&#039;s Charmed Memories and More. Fits both necklace and bracelet 3mm or smaller. The Unthreaded Hole Size is about 4.8mm-5mm.