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Ball bearing set, black rubber sealed, complete (3x6x2.5mm (8), 5x8x2.5mm (4), 4x8x3mm (4), 8x12x3.5mm (2), 3.5x7x2.5mm (4)). Reduce friction and increase the precision of your TRX-4M by replacing the stock bushings with these high-quality black-seal bearings. Black-seal bearings offer ultimate protection from the elements with less maintenance in dirty environments.