Reax PumpA smarter barbell that delivers better results. Reax Pump uses the momentum of liquid inside weighted attachments to bring a new level of muscular activation to your training. Reax Pump Configurations 5, 7. 5, 10, 12. 5 and 15 kg 11, 16. 5, 22, 27. 5 and 33 lb Reax Pump Ball 1. 25, 2,5, and 5 kg 2. 75, 5. 5 and 11 lb Reax Pump Bar 2. 5 kg and 5 kg 5. 5 lb and 11 lb Winning Features Soft Shock Thanks to its elastic nature, it is a unique functional