Starting out with raw 7075-T6 alloy plate, we stamp, coin, and CNC the rings to create a precise shifting whole. Coining shapes tooth profiles into designs CNC alone can\'t match, creating a stronger tooth by strain-hardening the alloy for superior durability. Stainless steel pickup pins give shifting longevity. Chainring-specific finishing technologies and laser graphics add durability and appeal.Low weight and excellent strength,Made of 7075-T6 aluminium,PowerGlide ramps/pins for optimized shifting performance,Black hard anodized finish,110 mm bolt circle diameter.