The 175RC B6/B6D 9 Gram Drop Weight Kit lets you take your chassis tuning to the next level. These Drop Weights fit into the milled slots in the chassis and weigh in at 9 grams. The 9 gram weights are reversible to allow user to position the weight towards the front or the rear of the chassis. These weights add weight to the lowest possible point of the chassis, holding the weight lower than when using a battery plate and helping to lower the CG of the car. 175RC recommends that you tape the weights in position to hold them securely.