Great set of carbon fiber Zipp wheels. I had them on a titanium road bike, which I no longer own. The 20mm internal is optimized for 28c tires. The hubs are QR (100/135) 6-bolt disk. Note these are clincher (for tubes) not tubular wheels.
Includes Zipp skewers and an Ultegra 11-speed 11-28 cassette.
Review here - Zipp 303 Firecrest disc https://share.google/FyjjlF9ybtaNzzZPG