DESC: FREE SHIPPING! Replaces up to 34 Dumbbells - with just the turn of a dial, you can automatically change your resistance from 10 lbs (4.5 kg) all the way up to 90 lbs (40.8 kg) of weight. Adjusts to your workout - adjust in 5 lb (2.3 kg) increments so you can gradually increase your strength. Space Efficient - Say goodbye to 34 dumbbells cluttering your workout space. Wider Weight Range - with weight that adjust up to 90 lbs., you'll continue to see results as your fitness level improves Total Body Results - with the wider weight range you can do heavy exercises such as shrugs and lunges as well as lighter exercises such as curls and raises.