Set of 5 Bauer Ringware Nesting Mixing Bowls . These are nesting mixing bowls. This set comes as five with the numbers 9, 12, 18, 24, 30. The #30 bowl has factory glaze skips otherwise has a new look with a shiny glaze. Bowl #12 has a glaze skip on the bottom rim. Marked 'Bauer Los Angeles', these bowls were made in the 1930's and each have their own assigned number--this represents the number of bowls of that size that will fit into the Bauer crate used for storage. Cobalt is a prized color for Ringware dinnerware.