The Front&Rear Axles Set - +4mm Extended Aluminum Complete Axles by Injora is a high-quality upgrade part for the TRX4M model. Made of durable aluminum, this set includes both the front and rear axles with a weight of 0.33 pounds. The +4mm extended length provides additional strength and stability for improved performance in RC off-road vehicles. No batteries are required for operation, and assembly instructions are not needed. Designed for kids and suitable for both front and rear use, this axle set is a must-have for enhancing your remote control vehicle experience.