A series of four-hole chainrings with High Stiffness Points (HSP), compatible with the Shimano ® Dura-Ace FC-9200 12v crank set. 
Manufactured from CNC-machined AL 7075 T6 aluminium alloy with a black total anodizing surface treatment (TT). 
Five teeth options available for internal chainrings and six for external chainrings. Aluminium chainring bolts included.