Campagnolo VELOCE ULTRA-Drive 10 speed Cassette & lockring. Stock in sealed retail box. Never mounted or used. Veloce sprockets use the Ultra-Drive system and are the fruit of continuous research and development to improve our products. The Ultra-Drive system makes shifting more precise and fluid, especially thanks to the careful machining and treatments that the sprocket teeth have undergone. The special sprockets pattern interfaces perfectly with the rest of the drivetrain components, especially the chain and chainrings, thus bringing performance to levels of outstanding excellence. Compatible with ALL Campagnolo 10 speed drivetrains. I ndividual steel cogs with spacers. Cogs: 13,14,15,16,17,19,21,23,26,29. Our goal is to have happy repeat customers and lots of great feedback.