Nothing is going to be as thin and flexible as this wire - it feels a little like waxed thread but can carry current! You could use this in wearables or very fine assemblies where weight and bulk is at a premium. Silicone wires are flexible but aren't as thin. Wire-wrapping wire is thin but isn't flexible. The covering for the wire is Teflon so its good from -80 to +105 degrees C

Comes in a spool with 10 meters of extremely thin (32AWG!) wire. It's very fine wire and calls for a steady hand to strip the end without accidentally chopping off the whole thing.

Rated for 30V and 90mA (it's really thin!) with a 0.38mm diameter