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.