Made from advanced aviation-grade 7075-T6 aluminum alloy, optimal lightweight design and CNC-machined for performance and lifespan! All aluminium MX rear racing sprockets are manufactured from the best materials with a special self-cleaning design, and hand-finished to perfection. Made from the finest 7075-T6 aluminum. Designed and built with the latest generation of computer design and control metal cutting equipment for maximum durability. Heat-treated and hand-finished to meet or exceed the highest possible quality standards. Note: Designated models require the purchase of a JT Sprocket Carrier, sold separately.