Bowflex SelectTech 1090 Adjustable Dumbbell (Single) Use the Bowflex SelectTech App to journal your strength training Space efficient - say goodbye to 17 sets of dumbbells Select the weight you want with a turn of a dial.With just the turn of a dial, change your resistance from 4 kg (10 lbs) all the way up to 41 kg (90 lbs) of weight Each dumbbell adjusts from 10 lbs to 90 lbs Durable molding around metal plates provides for a smooth lift-off and quieter workouts