The Bowflex SelectTech 552 Dumbbells bring you powerful results with the turn of a dial. This strength training system replaces 15 sets of weights and allows you to adjust them between 5 to 52.5 lbs as you gradually increase your strength. Features easy to use selection dials for weight adjustment with a patent pending locking mechanism that locks only the weight you select.Features Weight range 5 to 52.5 lbs (2.27 to 23.8 kg) for each dumbbell Adjusts in 2.5 lb increments 15 weight settings: 5, 7.5, 10, 12.5, 15, 17.5, 20, 22.5, 25, 30, 35, 40, 45, 50, and 52.5 lbs Premium grips Durable molding around metal plates provides for a smooth lift-off and quieter workouts Use the Bowflex SelectTech App to journal your strength training Replaces 15 sets of weights saving you space Over 30 exercises available to perform Change resistance with one turn Patent pending locking mechanism that seeks and then locks only the weight selected Dumbbell dimensions (each): 15.75" length x 8" width x 9" height (40 L x 20 W x 23 H cm) 2 year manufacturer’s warranty on all parts Model: 100130