Selected material for better durability: This 30kg dumbbell set is constructed of a cement weight plate covered with hard plastic and an electroplated iron dumbbell bar. Antirust and water-resistant materials provide you with a long use life. Our adjustable dumbbell set comes with 16 weight plates in 4 different weights (2.5kg/5.5lbs, 2kg/4.4lbs, 5kg/3.3lbs, 25kg/2.8lbs), 4 pieces for each weight, two 47 x 2.5cm/18.5 x 1'' iron bars with a 13. 6cm/5.4'' long handle for each bar, two star-lock collars. Customize it to your ideal exercise intensity. Our dumbbells have 16 weight plates in 4 different weights, 4 pieces for each weight, and 2 spinlock collars to make the adjustment easier. This dumbbell set features a hard plastic handle with diamond knurled texture on each bar to increase friction, ensuring the safety of your every workout. Our dumbbell bars with threaded ends and star-lock collars provide a secure workout and easy weight plate changes. Compact dumbbells are easily assembled within seconds. The customizable design cuts the need for multiple dumbbells in your home gym.