NÜOBELL Expansion Kit SilverFree shipping, delivery to your door in 3 5 business days. Expand your NOBELL 550 Black to a complete 580 set So what happens when 50 LB feels too little? Expand your existing 550 set to a complete 580 with up to 80 LB on each dumbbell. Comes with all the weights and the longer cradles fully assembled to convert your NOBELL 550 Black to a NOBELL 580 for much less than you'd pay for a whole new set of 580. Easy to make into a 550 again if you want to
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