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- Kettleblocks are the new, innovative way to work out with weights. The KettleBlock™ 55 lb Conversion Kit must be bought with the KettleBlock 40, as it allows you to expand the KettleBlock 40 to 55 lbs.
Extra Information The KettleBlock™ 55 Conversion Kit gives you these additional kettlebell increments: 45 and 55 lbs. Power Block Kettleblock 55 Conversion Kit Reviews
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