Hand Blown Murano Style Glass Beads glimmer with dazlling reflective qualities. The large holes in the middle are lined with gold or silver colored base metal, gnormmet style. This protects the glass from any friction that occurs with wear. The center is not threaded, so it will easily slide onto your chain of choice. These beads are handmade, so while they are all the same in material, they are different in shades and augments of colors on the glass.