Bowflex SelectTech 220 Dumbbells combine 8 sets of weights into one. They're an amazing strength training solution that gives you dramatic results and saves you tons of workout space. With just the turn of a dial you can automatically change your resistance from 2.5 lbs all the way up to 20 lbs of weight. All you need are two Bowflex SelectTech 220 Dumbbells to transform your body for good.