You will receive twelve ornate filigree cone shaped bead caps in oxidized copper plated brass. They fit atop beads which measure larger than 12mm but can easily be adjusted to fit other sizes and for other uses. The caps measure 13mm wide by 16mm tall. An example of how you might use these bead caps with a 12mm bead is also shown in the photo. In the second photo I've shown you how to open up this bead cap, place an 18mm size glass gemstone replica inside then close the "prongs" around the stone to create a perfectly proportioned setting. Those items are shown for ideas only and are not included. #T38