SRAM XX Ebike Crank Arm Set - 170mm, ISIS, BlackThe XX Eagle E MTB Crank takes from its race winning lineage and is optimized for E MTB use. Carbon fiber engineered with a foam core to give both incredible strength and maximized stiffness under the high torque environment of E MTB. Paired with the new XX Eagle Transmission (T Type) direct mount chainring, performance and design aesthetic blend together to provide our most premium, performance driven crank arm. Product Details: Carbon with foam core