Very well made, tough piston. Took a direct hit to the plastic teeth on a jam and still came out with just severe wear instead of being stripped completely.
Still works after hundreds of cycles on my modify SP 110 using a 9.6v 1500mAh elite battery and Echo1/JG Super High Torque motor.
-Strong as hell
-Durable design (reinforcement on plastic AND metal teeth!)
-May not be compatible with certain setups due to reinforcement.
-Adds a good amount more weight than a standard plastic piston