Only ever used once. Can be sold as cassette alone, for $300 or with Zipp Carbon wheels and Vittorio corsa tires for an extra $600, so $900 for everything. All are like brand new. Replacement cost is over $4300 (wheels $3500, cassette $650, tires $192) at 77 my time trialling days are over so i never used them. Bought them intending to race, and tested them round the block. These will transform your bike if you have a Campagnolo derailleur.