Not limited to different dumbbells combination, the fitness dumbbell 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, and back and also strengthen your muscles. Features: You’re free to customize the weight set to meet the training needs. Made of cement mixed substance and polyethylene, the fitness dumbbell kit provides you with various weight options, ranging from 10kg to 40kg. Compared with other sellers’ round shapes, our dumbbells are designed with 8 sides shapes. This prevents scrolling when you doing exercise and provides easier storage. while the dumbbells handle is coated with rubber to prevent easily slipping from hands. If there is any inconsistency between the images and the actual product you receive, the actual product will govern.