Unipack Neoprene dumbbells are made of cast iron and coated in variety of colors with Neoprene for comfortable ,durable and non slip grip. Each end of the dumbbells marked with clear number of weight for easy identification. Easy to pick up the right weight for daily workouts, aerobic, step training or walking. Enhance upper body strength, improve muscle tone, overall fitness, cardio Perform curls, tricep extensions, flies, help tone arms, shoulder and back. Hexagon design prevents it from rolling on the floor and helps to protect you, the floor, and other fitness facility and equipment in case of drops. Premium quality Neoprene coating will not crack, rust or fade. Compact size is perfect for home, commercial gyms and travel. Easy to clean and store away when are not in use.