This is a set of three, hard-to-find, Pyrex blue delphite or "Bluebelle" mixing bowls. The set includes the smallest which is marked 401 1 1/2 pt on the bottom. The next bowl is marked 402 1 1/2qt. The last is 403 2 1/2 qt. The bowls are in excellent condition and would make a wonderful addition to any vintage glassware collection.