【3-in-1 Dumbbell 】This adjustable dumbbell set comes with a connecting bar that can be easily attached to both dumbbells to transform into a barbell. There are also adjustable weight plates that let you customize the weight of the dumbbell/barbell to your desired setting. This allows you to efficiently use our dumbbell/barbell set for many exercises instead of buying multiple sets. 【Multi-weight setting】This weights dumbbell set comes with 16 weight plates: four 5.5 lb and four 7.1lb. plates. The lowest weight you can adjust to for each dumbbell is 5.5 lbs. The highest weight with all the plates attached is 88 lbs. 【Home Gym & Environment Protection】For people who need to exercise at home, this dumbbell set is the best addition. The Olympic weight plates and the switching mode of dumbbells and barbells allow you to get the same exercise intensity as the gym at home. This set of equipment uses environmentally friendly PE dumbbells, filled with a fine iron powder cement mixture to protect the floor from wear. 【Detachable Adjustable Weight】Multiple uses this dumbbell are ideal to exercise arms, chest, back, core, and legs. You can adjust this dumbbell from hand-held 2.75 lb to barbell 66 lb. There are four different sizes of dumbbell pieces for you to choose from. 【Customer Care 】Our goal is to give you the same full-body exercise intensity at home as the gym. Please contact us once you find a product received has failed your expectation, our customer service will try our best to respond to your satisfaction.