The new quadrilateral dumbbells are not easy to roll, and are your best choice for good strength exercises at homeDumbbell sets can be used as dumbbells and barbells. The weight of dumbbells can be adjusted at will to meet the needs of daily exerciseFeatures:Adjustable weight for diverse muscle training;Foam covered connecting rod to reduce neck's compression and relieve fatigue;Non-slip design with rubber coated handle for firm grip;Quick conversion between dumbbell and barbell, with the connecting rod;Easy to dissemble and assemble;Quadrangular shaped dumbbell plate to prevent scrolling and for easy storage, with no damage to floor.Each set includes 2 x dumbbell handles, 4 x spinlock collars, and the following plates:22lbs: 4 x 2.75lb / 4 x 2.2lb33lbs: 8 x 2.75lb / 4 x 2.2lb44lbs: 4 x 4.4lb / 4 x 3.3lb / 4 x 2.2lb(1x barbell connector)66lbs: 8 x 5.5lb / 4 x 3.3lb / 4 x 2.2lb(1x barbell connector)Package Includes:1 X Adjustable Dumbbells set2 x Sport glovesNote: 22 pounds and 33 pounds dumbbells do not come with connecting rods, 44 pounds and 66 pounds dumbbells are free with connecting rods, which can be used as barbells. You can choose different weights according to your preferences.