This is the replacement Pivot Ball and Dust Cap Boot Set for the Traxxas Revo, E-Revo and T-Maxx 3.3 vehicles. FEATURES: Nylon and Rubber Construction Blue and Black in Color INCLUDES: Four Blue Rubber Pivot Ball Boots Four Black Dust Boot Retainer Four Blue Notched Dust Boot Retainer Four Blue Rubber Boot Plugs Four nylon Pivot Ball Retainers Instruction sheet REQUIRES: Two packages needed to complete truck