This high-quality dumbbell set is made of concrete weight plates and electroplated metal bars. It comes with different weight plates for you to adjust to your desirable dumbbell weight. This weight plate set features 2 pairs of spinlock collars and non-slip handles to provide you with a safe and secure exercise experience. It is great for your upper body workouts, which helps tone and sculpt your arms, shoulders, back and also strengthen your muscles. With this dumbbell set, you can exercise at home, in the office or any place at any time. Features: *Durable Material: This 30kg dumbbell set is constructed of cement weight plates covered with hard plastic and electroplated iron dumbbell bars. Oxidation-proof and water-resistant materials provide you with long service life. *Adjustable Weight: 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 make the adjustment easier. *Non-Slip