Weight set brass 5gr - 12gr - 20gr (2+1+1) Set of weight set in brass material 5gr - 12gr - 20gr (2+1+1)Use to fine-tune the weight balance with all electronics mounted as well. The 20g and 12g are made to mount near the center line of the car, close to the belt. Made for the Serpent 411 , and the holes in the chassis to mount them are already available.