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Quick Shifting Performance: The RollerBoys derailleur pulleys make shifting gears a breeze thanks to the 12-teeth pattern SRAM Compatible: Suitable for use with SRAM 1x11 and 11-speed road bike systems Super Durable: Stronger than regular Nylon materials thanks to a 40% glass-fibre mix Ultra Smooth: Low-friction ceramic bearings with oil lubrication make for exceptional smoothness and durability Bushings Included: These jockey wheels come with a complete set of aluminium bushings for different shifting systems