Not limited to different dumbbells combination, the fitness dumbbells set comes with a connecting 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. Features: You're free to customize the weight setting to meet the training needs. Made of cement mixed substance and polyethylene, the fitness dumbbells kit provides you with various weight options, ranging from 10kg to 40kg. Compared with other seller's round shape, our dumbbells designed with 6 sides shapes. Which prevent from scrolling when you doing exercise and provide easier storage.while dumbbells handle is coated with rubber to prevent easily slipping from hands. All dimensions are measured manually with a deviation of 2 to 4cm. Similarly, other slight variations may occur between the product displayed and the actual product.