The Center Circle, or "Porthole" bracelet is made of 925 pure sterling silver. This bracelet has been a top seller for it's elegant and timeless look. Inspired by boaters on Cape Cod from the porthole on their boats. The bracelet unhooks for easy on/off use. Sizing is best done by measuring wrist and adding 1/2-3/4 inches. Generally speaking, a size 7 is average wrist size. Free size exchang if returned unworn. Ships in a box. Oval shaped for maximum comfort on wrist.