HPI Racing brand pair of optional 5x23.5mm Heavy Duty Differential Shafts. FEATURES: Fits the HPI Bullet ST 3.0, Bullet MT 3.0, Bullet ST Flux, Bullet MT Flux, WR8, WR8 3.0 and Savage XS Steel construction Reduces drivetrain wear and extends service intervals YOU WILL RECEIVE: Two Heavy Duty Diff Shafts SPECIFICATIONS: Length: 23.5mm Diameter: 5mm jxs 05/07/14 ir/jxs