Just pop one of these tabs in a reclosable plastic bag with your Sterling Silver jewelry or components to help protect them from tarnishing. They are good for at least 6 months, according to the manufacturer. They can also be used with Gold, Copper, Bronze Brass & Tin. Tabs measure about one inch square. Packaged by Beadsmith, anti-tarnish tab material is made by 3M. One package contains about 50 tabs that measure about 1 x 1 inch.