These are the highly regarded step-up transformers from Intact Audio (Dave Slagle). This pair of transformers have a 1:12 ratio and are wound on a nickel core with solid silver wire for both primary and secondary. In my system, Dave's transformers have the best detail and tone of any SUT I've tried, and are dead quiet with respect to RFI or hum.
These enclosures, which I believe Dave no longer sells, are triple-shielded and optimized for best sound. The enclosures have some minor scratches and blemishes.
Only selling as I recently purchased another pair from Dave (1:20) to use with a different cartridge.