These are the RPM Heavy Duty Rear A-Arms for the TRA Slash Short Course Racing Truck RTR (TRAC43**). Nylon construction Black in color Very durable Two Heavy Duty Rear A-Arms Installation on the vehicle Length: 95mm (3.7") Width: 47mm (1.85") Height: 10.5mm (0.41") Also available in Blue RPMC8472 cnh 11/8/08 ir/jxs &