I have been using these now instead of the 3M ones (that I buy from my jewelry supplier $4.10 for 20 of them).
Intercept Anti-Tarnish Strips - (2"x7")
The same technology used by NASA, the Guggenheim Museum & jewelry manufactures worldwide.
•Provides protection from tarnish for up to three or more years.
•Does not leave deposits on items it protects.
•Nontoxic, non-abrasive, and will not scratch or harm metals or gemstones.
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Before placing item in pouch, be sure item is clean, dry and free of fingerprints and deposits.
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Size - 2" x 7"
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Sold in pk of 20
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Technical info here:
http://www.interceptjewelrycare.com/how.htm
$6.25 for 20 of them here:
http://www.riogrande.com/Product/Interc ... x-7/401526