These are the Front Sponge Tires A for use on the Tamiya F104 Chassis Vehicles. FEATURES: Sponge construction Black in color Softer composition that Sponge Tires B INCLUDES: Two Front Sponge Tires A REQUIRES: Installation on the front wheels SPECS: Outer Diameter: 61mm (2.4") Inner Diameter: 44mm (1.7") Width: 30mm (1.2") TamiyaPart TAM51384