These adjustable dumbbells replace 17 sets of weights. The weights range from 4.5 to 40.5 kg and the dumbbell has easy-to-use adjustment wheels for changing weights. Simply switch from one exercise to the next and with the turn of a dial you can gradually increase the weight. Ideal for body toning and strength training for upper and lower body, including heavy leg lifts. Compatible with the free Bowflex SelectTech training app for iOS and Android.