SET OF TWO: Double the exercise, can be used simultaneously to double the workout or individually with a friend. 4KG WEIGHT: Semi-light, it is great for beginners who want to continue to build muscle. Hexagon shaped ends prevents weight rolling away. STEEL CORE: Tough and strong, with knurl indents for grip - prevents weights slipping and causing injury. DIMENSIONS: Single dumbbell: 27.2Lcm. Handle: 12.8Lcm. NO ASSEMBLY REQUIRED.