The new Dura Ace from Shimano is the answer to the question many professionals and ambitious amateurs have about whether and how the already incredibly high level of performance can be further enhanced. Each individual Dura Ace R9100 component is designed to work as efficiently as possible with all other components of the system. This clearly demonstrates the core of Shimano's philosophy of system-developed components. The result is called System Supremacy - the superiority of the system over the sum of its individual parts. Shimano Dura Ace brake caliper for Dura Ace ST-R9120, ST-R9170, ST-R9180 shift/brake levers. • Material: Aluminum • Design: Front • Brake pad: L02A-R, L04C-M (K02S-R, K04S-M) • Brake technology: Hydraulic • Intended use: Road bike • Weight: 257 g • Details: - Recommended brake lever: ST-R9120, ST-R9170, ST-R9180.