Magneking Magneto Patch
$8.95Price
Box of 10 patches
From the manufacturer: "Magneking is a magneto patch designed to give magnetic force stimulation in the precise spot of the tense or tired muscle. Magneking adheres to skin firmly even during [a] shower ... Good for: tired and tense muscles; makes you feel better." Made in Japan.
More information (note: the following links are to third-party websites, and we do not guarantee their accuracy):
WebMD: Magnet Therapy
New York Times: Study on Using Magnets to Treat Pain Surprises Skeptics