The GRX ST-RX815 Di2 Shifter has an anti-slip texture, coating, and a raised hood head to prevent hand misalignment and slippage. It also features a recessed finger notch to prevent upward slipping, tooled reach adjust to fit multiple hand sizes and riding preferences, and a higher brake lever axis and curved lever to allow for higher braking efficiency and reduce fatigue on long rides. Additionally, the lever is equipped with BR-RX810 flat mount disc brake caliper, which provides greater multi-surface brake control and features Shimano ICE technology for excellent heat dissipation.