PATENT WEIGHT ADJUSTABLE DESIGN: Nice C adjustable dumbbells come with removable weight bars that allows you to set your desired weight. The ends of the dumbbell can be opened and weight bars can be either added or removed upon your preference. This allows you to efficiently use one set of dumbbells for many exercises instead of buying multiple sets. COMPREHENSIVE EXERCISE SET: Unlike most dumbbells that require multiple purchases for different weights, this all-in-one dumbbell allows you to have a versatile workout. These dumbbells can be used to sculpt your arms or tone your back. This product is perfect for improving overall health or encouraging weight loss. It can also help strengthen your upper body or core. The adjustable design makes it easy to stay fit at home. MULTI-WEIGHT SETTING: The dumbbell alone weighs 2.3 lbs. each. Weight bars are included to allow you to adjust the weight of your dumbbell. There are 4 weight blocks total for each dumbbell. Each weight bar weighs 0.55 lbs. In order for the sides to be even, you must add them equally on each side. The lowest weight is 2.3 lbs. and the highest weight is 4.5 lbs. per dumbbell.