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•RollerBoys equipped with low friction ceramic bearings for ultra-smooth glide and exceptional durability.
•Lubricated with special ceramic light oil for extra smoothness.
•Composite material provided by EMS Swiss, with 40% glass-fiber.
•Complete set of bushings for different shifting systems included.
•11T. Compatible with Shimano 9, 10 & 11 speed / Mega Range and Campagnolo 11 speed.