These lockets have a strong magnetic clasp and are made of stainless steel for those allergic to nickel. They can be opened and you can switch out different charms and pictures as you please. A cute and dainty accessory to your everyday outfits as well as a keepsake gift to your loved ones. This product is a higher grade of the favorite amongst our customers and they love the ability to make customizable gifts. Versus sterling silver stainless steel does not tarnish as easily and is resistant to harsh chemicals.