These are the Rear Suspension Arms in Exo-Carbon for the Jato from Traxxas Performance Accessories.
One Pair (Left and Right)
Length: 4.46" (113.3mm)
Width: 1.64" (41.6mm)
Thickness: .28" (7.3mm)
Exo-Carbo parts are fuel resistant in normal use. Prolonged exposure to raw fuel may weaken or damage the finish.