Materials: They feature a hard plastic knee cap

silicone grippers on finger and thumb

Made of 3DF AirFit soft impact foam

Compatible with common external BBs and 16-notch centrelock rotors

Shimano RT-EM600 eBike Centerlock Internal Serration Disc Brake Rotor - 203mm - Centrelock Do Not Ship Internationally Materials: They feature a hardThe Shimano RT EM600 eBike Centerlock Internal Serration Disc Brake Rotor is an eMTB rotor that is purposely made for Shimano's STEPS System. They deliver powerful and consistent braking performance in all riding conditions by using 'Shimano's Ice Technologies Freeza' feature that greatly improves heat dissipation and ensure consistent high performance braking even on the steepest downhill stretches. They even have a cleverly placed Speed Sensor