This is a rather small piece measuring in at 22mm by 18mm. It is light weight and inexpensive so I usually put two back to back. This way it makes the perfect weight for an earring and looks very professional. If you plan to use it to make a necklace with this piece being part of the links, you really do need to put them back to back because they will have a tendency to flip. When they flip they will look good on both sides. You will receive 4 per order.