[Instant Adjustment In Second from 4 to 10 pound] The innovative structure of RUNWE dumbbells set of 2 allows you to quickly adjust from 4 to 10 pound, allowing you to increase/decrease the weight in the blink of an eye! Greatly improves the efficiency of your training. [5 in 1 Dumbbells Set] With the 5 in 1 Dumbbells Set, you can get 4 pair of dumbbells also push-up stands, whether you're targeting strength training, muscle toning, or endurance building, this versatile 5-in-1 design has you covered.