Item number: CS21.
The sprockets are made up of two sections of 4 and 3 sprockets connected by an anodized CNC aluminum spider which gives the entire sprocket pack a remarkable lightness which is completed by the remaining single gears.
Sprockets compatible Shimano 11 speed: ul>

11-13-15-17-21-24-28-32-36-40-46 (569 g)

11-13-15-17-21-24-28-32-36-42-50 (582 g)

11-13-16-20-24-28-32-36-40-46-52 (679 g)