This is the Aluminum Front Pulley Shaft for the Traxxas NITRO 4-TEC PRO. FEATURES: Blue anodized Light weight aluminum INCLUDES: One front pulley shaft REQUIRES: Assembly onto the kit. SPECS: Length: 74mm (2.91") Diameter: 5mm (0.20") COMMENTS: This is mounted in the middle of the chassis and two pulleys ride on it. jm 10/17/02 ir/jl