This is a single 5 oz custard cup in the Philbe sapphire blue oven ware pattern by Fire-King. It is 3 3/4" wide and 2" high, in excellent condition with no chips or cracks. The base is marked Fire-King Oven Glass. Sapphire Blue was produced between 1941-1956. I also have a set of three other Sapphire Blue Philbe custards listed separately, they are shaped a little differently.