Perfect for jewellery which you find tarnishes easily as well as for travel, our anti tarnish bags do exactly that, they stop your silver and gold jewellery from tarnishing. they use semi-conductor technology to transform plastics into a protective reactive barrier against corrosive gases, which in turns stops your jewellery from tarnishing. Intercept Technology‚Ñ¢ polymers are non-toxic, non-abrasive, and environmentally friendly. Intercept‚Ñ¢ does not emit any chemicals or oils and will not leave deposits on the items it protects. The zip lock style makes them perfect travel cases for your jewellery with the bonus of tarnish protection! this is a 5 pack of 6x6 inch bags and each bag lasts up to 10 years. The bags will start protecting your jewellery as soon as you place them inside - just make sure they are clean and polished when you pop them in.