These are round foam ball cup dust covers. These are inserted into the ball cup and keep track dust from wearing away the tight fit between the ball and cup.
Part Compatibility:
Team Associated SC10
Team Associated RC10B44.1
Team Associated RC10T4.1
Team Associated RC10B4.1
Team Associated RC10GT2
Team Associated RC10GT
Team Associated RC10B44
Team Associated RC10B4
Team Associated RC10T4
X Factory X-6 Squared
X Factory X-60