Dreambell 50 pcs Metal Silver Gold Anti-tarnish Preventer Jewelry Protector Square Tabs 1 inch/Findings Anti-tarnish protection for metal, silver, gold, gemstones and other jewelry Size: 1 inch x 1 inch Will not harm the jewelry. Inserted into boxes, zip bags and other containers. The protection period varies depending on the storage: A) Loosely sealed container (Cardboard box) 6 months; B) Moderately tight seal (flap top bag) 12 months; C) Tightly Sealed (zip-lock bag) 24 months