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Novak Ball Bearings 1/8 x 3/8 x 5/32 Steel ABEC 3 (Qty 2) Novak's Steel Ball Bearings ABEC-3 (1/8I.D. x 3/8O.D. x 5/32W) include high-performance steel balls. These bearings are used in most 540-size motors and are replacement rear bearings for Novaks Velociti, SS Pro and HV Pro Brushless Motors.