STRIKE COMPOSITION
$2 and $3 strikes are made of Brass
$7 strikes are .999 Silver with approximate weight of 0.65 ounces.
$10 strikes have a .999 Silver center insert, outer ring is Brass, approximate Silver weight is 0.60 ounces of Silver. New smaller center insert strikes have less silver.
$20 strikes have a .999 Silver outer ring with some 24K Heavy Electroplating (HE) and a Bronze 24K Heavy Gold Electroplate (HGE) on the center insert, approximate Silver weight is 0.75 ounces of Silver.
$28 strikes are .999 Silver with 24K Gold Plating (GP), approximate Silver weight is 0.65 ounces.
$40 strikes are .999 Silver with 24K Heavy Electrolplate (HE), approximate Silver weight is 1.54 for the large size $40 strikes and 1.26 for the small size $40 strikes.
$200 strikes are 1 troy Pound (12 ounces) of Silver and may have some 24K Heavy Ellectroplating or for the newer RWM mint strikes may have colorization.

From: http://www.silverstrikers.com

Only thing missing is the fake "silver" strikes that some places like cruise ships had that were HSE (or what is the marking?) for High Silver Electroplating, and basically a chunk of silver plated brass.

If someone looks at a $7 strike, not us, but someone else, the silver value is more than the face marked value. Almost $9 right now. This might cause some of them to be melted down in the future, which would be sad.

At current market a $10 strike is still worth more at face value.