Electric Brakes with 70mm (2.75") x 14mm Rubber Wheels for 4mm Axles from JP Hobby - JPH6001-104
The JP Hobby Electric Brakes are the ultimate choice for your model aircraft braking. Say goodbye to outdated pneumatic and servo-applied systems, and hello to effortless control and installation. With high quality aluminum construction, precision ball bearing wheels, and replaceable hollow rubber tires, this system is a must-have for any aircraft enthusiast!
Features:

Operates off of the flight battery or a separate 7.2V-30V battery
Auto shut down after 1 minute of inactivity to reduce battery consumption
Signal Input: Connects directly to receiver to operate