How big was the scutum shield

There are very few good remains of scuta as they were made of wood and leather which deteriorated over time. However what the history people have pieced together is that a scutum was a large rectangular piece of equipment. Depending on the times, it could have a slight curve to protect the body a little better. A relatively well preserved one was found at Dura Europa and it was 3 feet 3 inches long, 2 feet 8 inches wide and 2 inches thick. Adding in its iron boss and bronze edging it weighed about 12 lbs. Some had reinforced centers which added another 4 1/2 lbs to the total weight.