15 STAR WARS Flat Bottle Cap Necklaces for Birthday, Party Favors, Bag Fillers Set 2 15 STAR WARS Bottle Cap with silver plated metal ball chain necklaces. Necklaces measure 20" 2.5 mm, attached individually. The bottle cap pendant measures approximately 1 inch and is blank on the back. These necklace pendants are not waterproof. I DO CUSTOM ORDERS