These small silver Swallow charms come from a company in California called TierraCast. They are 100% made in the USA and are nickel free! This beautiful Swallow is made using Cadmium & Lead free Pewter and is plated in .999 Britannia Fine Silver. This swallow is perfect for hanging from a Ball Stud Ring or O-ring on a Day Collar, but not from a Dee Ring or it will hang the wrong way. The dimensions on the spiral butterfly are 16.5 mm wide x 17.5 mm high and the internal diameter of the loop is 2.25mm. I include a small silver jump ring when ordering this charm. This little Swallow charm is perfect for a Princess DDlg collar.