The metal is hypoallergenic 925 sterling silver (nickel-free); rhodium plated, to improve protection from oxidation, humidity and chemical agents. The clasp features a practical and functional spring ring. The width of the chain is 1.9 mm. The jewel will be shipped in an original gift box where you will also find a certificate of guarantee and a guide on how to store and clean your silver jewelry. Perfect gift for your boyfriend, dad, fiancé, husband or friend for birthday, Valentine's Day, Christmas or anniversary. Jewel entirely designed and made in Italy, 925 hallmark to guarantee authenticity and quality. TECHNICAL DETAILS Width: 1.9 mm* Thickness: 1.9 mm* Length: 40 cm - weight: 5.2 gr* Length: 45 cm - weight: 5.8 gr* Length: 50 cm - weight: 6.5 gr* Length: 55 cm - weight: 7 gr* Length: 60 cm - weight: 7.6 gr* Length: 70 cm - weight: 8.8 gr** Weight, width and thickness may vary by 5%.