What's a backing??? Often times I make a pendant that is awesome, yet the back of it is lacking which makes the pendant look unfinished. So I have begun to purchase pieces that are relatively inexpensive that can be glued to the back for a finished look. I always use E6000 glue. This is one of those pieces. It comes in two sizes. This listing is for the larger size that measures 40mm round. I call this Persian Disc because the 8 pointed star has been used in architecture in the Middle East for centuries.