These wonderful beads come in a variety of colors. While they are ceramic, they are very strong beads. The large holes average about 2.6mm, allow up to a 12 gauge wire and will fit the bangles, except for the plated ones.
The 8mm disks are sold in 15 gram packets with approximately 80-90 beads per packet. The 13mm disks are sold in 30 gram packets with approximately 60-65 beads per packet. Metal plated disks usually have holes about 2.1mm. Plated disks are finished in fine silver(99.9% pure), 23kt gold, or copper. Refer to the description for packet size on metal plated beads. The thickness of the beads may vary a bit but the average is 2mm.