probike:The chainrings are machined from a single block of steel-strong 7075 alloy and Anodic coat
probike: The chainrings are machined from a single block of steel-strong 7075 alloy and Anodic coated. After 8 hours in the CNC, the end result is a super stiff structure that weighs 150 grams. By Unprofessional cyclist -- source link