From UNOde50, this bracelet features: Each UNOde50 piece is unique. Designed and manufactured at its headquarters in Madrid, all products are handcrafted in Spain. All of our jewelry is made of a special metal alloy. The pieces are then plated with silver or 18K gold. All jewelry is hypoallergenic and nickel free. Silver-tone plated metal Nickel free Snap closure Handmade Medium: approx. 6.4-7.4" Extra Large: approx. 8-8.6" One-year guarantee Imported.