This adjustable dumbbell set offers a flexible way to train at home, with weight plates filled with iron grit and encased in PE material to help prevent rust and protect floors. The thickened foam connecting bar has an ergonomic shape that reduces shoulder strain and helps prevent sports injuries. The 66-pound set includes 4 plates at 2.76 lbs, 4 at 3.3 lbs, 4 at 4.4 lbs and 4 at 5.5 lbs, plus 4 dumbbell nuts, 1 connector and 2 dumbbell bars, so you can pick the weight that suits each stage of your routine. Use it as a dumbbell or connect the bars for barbell training, supporting balanced strength work for the biceps, legs and abdominal muscles. It assembles and disassembles easily and stores under a table when space is limited.