See: RDRP

Revolution Design Racing Products have introduced new brass rear weight for all XRAY XB2 with laydown gearboxes. The weight is made from high-quality brass material and is a direct fit to the vehicle’s gearbox. The weight adds 34g to the rearmost part of the chassis for increased traction in lower grip conditions. The weight comes coated in black and with machined gold-colour edge details to match the remainder of RDRP’s brass option parts.