This is the Stock Replacement Disk Brake and Adapter for the Nitro 4-Tec. FEATURES: Black, woven fiber construction Adapter is black nylon INCLUDES: One brake disk One brake adapter One adapter pin REQUIRES: Installation into Traxxas Nitro 4-Tec. SPECS: Disk outer diameter: 26.3mm (1.04") Disk thickness: 3.3mm (0.13") Pin length: 9.8mm (0.39") Pin diameter: 2mm (0.08") COMMENTS: This part is designed specifically for the Nitro 4-Tec. cmc 05/04/02 ir/kh