This stunning Rainbow Wave Tumbler makes a custom perfect favor choice to match your underwater Prom theme! The 16 oz. insulated tumbler comes with an iridescent insert that looks nice and wavy--like the multiple colors of the sea! Customize your Rainbow Wave Tumbler by adding your choice of a one-color screen-printed design to one side of it. It's a great keepsake for Prom, Homecoming, or your Senior Party! Also includes a clear lid and straw. Measures 3 1/2" diameter x 6" high. NOTE: Not recommended for dishwasher or microwave. BPA free.