-No Superior Designs RC Losi Mini-B and Mini-T Aluminum Micro Servo Saver. CNC-machined from extremely lightweight and rigid aluminum, this optional servo saver is intended for the Mini-B and Mini-T equipped with the EcoPower WP173 or RS100 micro servos or any other compatible micro servos to enhance durability and protect the servo internals!Includes:(1) Aluminum Micro Servo Saver(1) Spring(1) Flat Head Screw