This is an optional XRAY Hard Composite Rear Lower Suspension Arm, and is intended for use with the XRAY XB9 1/8 scale buggy. This suspension arm is molded from a redesigned blend of XRAY's proprietary composite material. Specifically designed to be used in extremely hot conditions, this Hard composite will reduce flex and deformation in the extreme heat. However, due to the reduced flex, the arms are also resistant to extreme impacts. This arm has also been made longer for increased stability. This package includes one suspension arm that can be used on the left or right side.