Shimano GRX, with its gravel specific ergonomics, optimized gearing options, rugged reliability, and quiet and stable drivetrain, sets itself apart from the rest of the component world GRX series offers premium performance at an incredible value, with thoughtful ergonomic designs and gravel-centric gearing for all manners of unpaved adventures. Features: GRX hydraulic disc brake Di2 STI's give you control, modulation and power with minimal effort in all riding conditions -Higher brake lever axis and curved brake lever, improves grip and confidence on choppy surfaces and descents -Raised hood head prevents hand misalignment and slippage -Recessed finger notch prevents upward slipping -Anti-slip texture and brake lever coating gives higher braking efficiency and reduces fatigue on long rides -12-speed E-tube Di2 compatible Product specifications - MODEL NO: ST-RX825 SERIES: GRX DI2 Shifter Type: DUAL CONTROL LEVER Remote switch Shift Lever: Rear speeds: 12 Compatible rear derailleur type: Road 12-speed Reach adjust tool Clamp band (mm): 23.8-24.2 Funnel bleeding Free stroke adjust SERVO WAVE Shifter Lever Body: Main: GFRP Di2 Connectivity Di2 shifting Left shifter is 2-speed, right shifter is 12-speed Genuine, brand new, boxed Shimano product - Biketart are an official UK Shimano stockist.