Adafruit Stainless Medium Conductive Thread - 3 ply - 18 meter/60 ft | Code: 641

This thread is 3-ply, thicker than everyday polyester or cotton thread but still thin enough to be sewn by hand in medium-eye needles. It's thin, strong, smooth, and made completely of 316L stainless steel.
This may be sewable by a sewing machine that can handle 'heavy' thread. Because it is strong and smooth, it's ideal for any wearable/e-textile project. It also has fairly low resistivity, 10 ohms per foot so you can use it to drive LEDs and other electronic components that use under ~100mA.
Because it is made of stainless steel fibers, it will not oxidize like silver does: your projects will not 'stop working' because of oxidation after a few months and it’s safe to wash. However, this thread is a little 'stiff', it feels a little like 'waxed thread' and is not ideal for making iPhone-compatible gloves.

Comes in a bobbin with an 18-meter/60-foot wound.