Wonder Solder [ TRT-Wonder.com ] is a proprietary silver solder. Some cynics might say Wonder Solder got its name because the people that started the firm wondered if anyone was crazy enough to pay that much for solder.
Most audiophile silver solders range 2-5%. Some might agrue that Ersin SN62 (available at Radio Shack, although in thinner gauge, part #64-013) is identical, but without the cache.
Audiophile tweekers like silver solder, because it makes them believe their gear sounds better. There's a fair amount of discussion of this on the web, for example: http://www.audioasylum.com/scripts/t.pl?f=Tweaks&m=35321
reply »