While there is only one of each style, there are several styles of these eye-glass holders. They hold the stems of your glasses securely with sliding knots formed of wax thread. Whenever you wish, however, those with crystals and wire can be converted into necklaces, some with attachable pendants, and secured at the back of your neck with large "S" hooks included with your order. While I did find other eye-glass holders online, mine are the only ones I know of that are convertible into necklaces. BTW, the crystals are of the finest European manufacture that are now discontinued. We're not allowed to use their name in our ads, but a simple search will reveal the name of this world-renouned crystal maker. Also pictured are close-ups of the pendants available to add to your necklace.