microSHIFT's H11 cassettes are manufactured to exacting tolerances for straightness, shift quality, and durability, resulting in responsive shifting performance that lasts longer than you might expect. Continuously molded cogs are straighter than stamped steel, resulting in more consistent, predictable shifting performance Precision ramps and chamfers for rapid chain movement Compatible with SRAM and Shimano 11-speed systems Steel lock ring Chrome plated for hardness and corrosion resistance