Lightweight Graphite Rear Lower Suspension Arm Right -1.0mm for BD-11/BD-12 is a genuine Yokomo RC product. It is intended for BD-11/BD-12 compatible Yokomo chassis. It is a Yokomo option or replacement part for maintenance, setup adjustment, and performance tuning. The shorter arm length helps chassis roll contribute to traction, especially on lower-grip outdoor asphalt surfaces. The lightweight design reduces unnecessary mass and helps sharpen chassis response.