Adjustable fitness dumbbells set with a metal connecting rod which is more durable, can provide you a safe and secure exercise experience Dumbbells are connected by a connector rod to become a barbell to meet the needs of upper and lower body workouts, which helps tone and sculpt your arms, shoulders, back and also strengthen your muscles Strengthens your core in an effective and safe way, helping you to burn calories, improve your abdominal endurance, and build a six-pack Special embossing prevents dumbbells from rolling, easy to capture high-temperature resistance, not easy to aging, anti-rolling design With this dumbbell set, you can exercise at home, in the office, or any place at any time