Here's a close-up view to give you a bit more visual perspective on our different size lockets.  The largest size, our 30mm lockets, flip open and closed by virtue of a magnetic clasp.  The 25mm and 20mm lockets twist open so that you can switch the insert plates as often as you like.  Just add a few drops of your favorite oil to the leather disc inside, close the locket and enjoy the aroma all day!