See: RDRP

Revolution Design Racing Products have introduced their new Ultra brass shorty battery weight. Machined from high-quality brass material, it comes in a black and golden finish. The plate can be used in pretty much every vehicle that accepts shorty-style LiPo batteries and it comes in handy to fine-tune the weight distribution or to add weight when using low centre of gravity shorty packs. The plate lowers the car’s overall centre of gravity for improved cornering performance on both low and high grip surfaces.