These small silver Monarch Butterfly charms come from a company in California called TierraCast. They are 100% made in the USA and are nickel free! This beautiful Monarch Butterfly is made using Cadmium & Lead free Pewter and is plated in .999 Britannia Fine Silver. This butterfly 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 monarch butterfly are 16.25 mm wide x 11.5 mm high and the internal diameter of the loop is 1mm. I include a small silver jump ring when ordering this charm. This little Spiral Butterfly charm is perfect for a Princess DDlg collar.