We don't feature tires here very often but those stood out. They are call HP406 and are produced by Panaracer. The company is part of Panasonic and is the last bicycle tire producer is Japan. The olderschoolers out there might recognize the HP406 tires. They are basically Peregrine HP tires.
It appears to be difficult to get ahold of some HP406 outside Japan. But at the moment Flatlandfuel has them in stock. We collected some technical details and photos in the parts section: Panaracer - HP406 Tires