It's Great for strength training and exercise in the water. Benefits Exercising with FANZEOS dumbbells is not only an aerobic workout that benefits the cardiovascular system, water aerobics is also a strength training regimen, due to the natural resistance that the water provides. These easy to store aquatic barbells are a perfect addition to your water aerobics workout. They come as a set of 2 and each weighs .66lbs. Made from EVA foam, they measure 11"long x 6"wide. 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. Warning: These are not to be used as a flotation device.It usually takes 5-14 days to arrive.