New for the Serpent 747 are these purpose made brass slide-weights which can be mounted into the slots pre made in the 747 chassis. Weighing 25 grams each, a maximum 3 can be fitted, they are black coated, laser engraved and come with the correct mounting screw. The chassis has 3 slots for the slide-weights, which slide in position and are secured with the screw and the chassis and set-up sheet show lines to indicate and record the set position. This is a very easy and fast setup change which has a lot of influence on the cars balance and handling.