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Soapbox Derby Econo Power bearings are the most affordable way to replace stock bearings with high quality standard bearings. Boca's Econo Power Soapbox Derby Bearings have long been the industry standard for Soapbox Derby hobbyists the world over. These bearings have chrome steel races, balls, retainers and shields. All Econo Power bearings are packed in grease and will require a short break in period to loosen up.