Some fading on red bowl. This is a set of three vintage Pyrex mixing bowls from the 1940s. The bowls are made of glass and come in the primary colors of blue, red, and green. They are round in shape and nest inside each other for easy storage. The set includes three bowls with model numbers 401, 402, and 403. The bowls are part of the Primary product line and are considered collectible. They were manufactured in the United States.