Actual, flexible, ~~ductile~~ ribbons. It's a new thing just in the last few years. The key turns out to be some kind of high-energy ion beam bombardment as the crystal is growing on the ordinary metal substrate.

The pixy stix wires produced pretty crummy quality superconductor, AFAIK, besides just being harder to work with.

Edit: Actually, the HTS itself is still a ceramic, so probably not ductile. Flexible and tough, though.