This water sports workout set is the perfect supplement to your aerobic exercise in water. They consist of two water dumbbells and a swimming belt, each dumbbell weighing 4.5 ounces. Made of EVA foam. While the EVA foam has low water absorption, we recommend storing the weights on end in a tray so any water that may have accumulated can drain. The resistance of the barbells will provide an overall workout for your upper body, lower back and abs. The swimming belt has an adjustable buckle, suitable for the waist circumference of the vast majority of people, and is used as a floating device.