These 3 pairs of hexagon dumbbells with rubber heads are perfect for your phased fitness regime, suitable for home, gym and office exercise. Each weight is built with metal and rubber, making them durable and not easy to scratch the floor. The knurl guarantees your safety when you do alternating dumbbell curl, overhead shrug, dumbbell triceps kickback, etc. It's an ideal way to make exercise routine and to increase intensity of exercise gradually with the dumbbell sets.