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 it's good from -80 to +105 degrees C

Comes in a spool with 10 meters of pretty thin (30AWG!) 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, with an outer diameter of 0.5mm