OP.598 Fluorine Coated 5mm Aluminum Pillow Ball (8 pieces) 53598 [Parts useful for improving the performance and setting of RC cars] The surface of the aluminum pillow ball is coated with a fluorine coating that provides excellent lubricity. This smooths the movement of ball connect parts such as adjusters, and also achieves weight reduction compared to the kit standard brass. [Basic Specifications] 5mm Aluminum Pillow Ball x 8 *Originally 10 pieces included, but 2 were attached to the chassis, so only 8 pieces are offered.