This is the Revolution Design Racing Products 30 Gram Ultra Motor Weight. The 30g Ultra Motor Weight is designed to allow hassle-free chassis weight distribution changes. With the enormous power brushless motors and LiPo batteries offer it is often recommended to add additional weight to the chassis, especially on bumpy and low traction tracks.
CNC-machined from high-quality brass, the 30 gram weight is 4mm thick. The RDRP Ultra Motor Weight is inserted between the motor and the motor holder and adds weight where your chassis needs it. Especially in 2WD buggies and 4WD touring cars where the motors are often located near the roll center, this is the perfect place to add weight.