Moderately aggressive tread ''Scaler CR'' and ''Duratrax C3'' white lettering on sidewall Duratrax C3 compound compares to the Pro-Line M4 super soft, and the AKA Super Soft compound Wheels constructed of molded plastic, black in color 1.9'' Scaler CR Mounted Black (2) (12mm Hex) C3 Duratrax Dimensions: diaouter: 119 mm diainner: 45 mm Width: 42 mm