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RVFM Mild Steel Ball Bearings RVFM 70 0157, Mild Steel Ball Bearings, ideal for demonstrations and experiments with magnets and magnetism. They can also be used for making the traditional 'get the ball into the hole' types of puzzle or maze games as part of a design or technology project. Naturally, they can also be used in bearings and for demonstrating methods of reducing friction. RVFM Ball Bearing 532in. Pack of 100
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