Achla Designs Crackle Glass Bowl, 12-in, Cobalt Blue Bowl measures 12 1/2-in diameter by 2 1/2-in D Crackled Cobalt Blue handblown glass, expect color variation Ideal for use as a birdbath, for catering or a table centerpiece Use with our Achla Designs Birdbath Hanger, BBH-01 or Short Stand , GBS-22 Winter protection for glass bowls is recommended. Do not allow water to freeze inside.