This mountain bike chainring features a hard-wearing alloy construction, which makes it absolutely ideal at handling all of the intensity that comes with all-day epics in the mountains. FSA has also specifically designed this model for use with the FSA SL-K Modular crankset or FSA Powerbox system. These direct mount chainrings coincide perfectly with the SL-K Modular Crank. Shifting performance has helped Full Speed Ahead to become a world leader for high-end chainrings. No one studies the design & manufacturing of each system, & each tooth, as carefully as we do. Our dedication shows in every revolution of the crank, & every perfect shift achieved. To meet or exceed the needs of any drivetrain, Full Speed Ahead has developed sophisticated design, testing & manufacturing protocols. This allows Full Speed Ahead to match your needs as perfectly as our chainrings match a chain. We offer more options, levels, & finishes than our competitors. We use the best materials available, imported from the USA, Europe, or sourced from our qualified vendors in Asia, to guarantee the durability, performance, & appearance will outperform, & outlast the competition. Full Speed Ahead chainrings have powered multiple World, Tour de France, & Olympic champions, & will exceed your expectations.