A one-of-a-kind flame worked borosilicate glass capsule charm containing a mini key inside. Borosilicate (Pyrex) can withstand clumsiness and everyday use.
 
This charm comes with either a clip ring or a jump ring. If you are purchasing an extra charm to go with a zipper necklace, choosing the clip ring will allow you to easily interchange one charm for another. If you are buying the charm to be put on a chain a jump ring is more suitable. 
 
You also have the choice of buying this charm on an 18 inch sterling silver, stainless steel snake chain or two toned stainless steel chain. 
 
Please note since each charm is handmade there may be a slight difference from what you get and the photo, but it will be as close to how you see it here as humanly possible!