With just the turn of a dial you can automatically change your resistance from 5 lbs. all the way up to 52.5 lbs of weight. No more picking up 30 different dumbbells to get the results you want these adjustable dumbbells replace 15 sets of weights. Keep working out with JRNY wherever you go from your phone or tablet; try the Mobile-Only Membership free for 2 months. All you need is two SelectTech 552 Dumbbells to transform your body for good.