e*thirteen e*spec Race Carbon Ebike Crank Arm Set - 165mm Shimano EP8 E8000 Carbon Fibere*thirteen e*spec Race Carbon Ebike Crank Arm Set 165mm Shimano EP8 and E8000 Carbon Fiber. e*thirteen e*spec Race carbon ebike crank arms are designed to minimal weight and maximum pedaling efficiency. Protective vinyl wrap and boots provide protection for the arms which have additional material on the front and rear faces for impact resistance. 8mm self extractor in each arm Crank boots included Stealth Black w protective vinyl covering TECH SPECS