Our Traxxas Nitro Rustler, Nitro Stampede, & Nitro Sport rear A-arms are as tough and as durable as it gets. Our A-arms incorporate all stock geometry; yet have been redesigned for strength, looks, performance, and durability. Our rear A-arms have been designed to lower the A-arm's center of gravity without affecting ride height or stock geometry for better handling characteristics as well. In addition, RPM Nitro Rustler & Stampede rear A-arms are actually lighter than stock components! These A-arm sets are sold in pairs and come in either black or our extremely popular blue, which is molded into the A-arm for unparalleled scratch resistant color.