With its rainbow, iridescent sheen, this Rainbow Wave Tumbler is a must-have favor for any underwater Prom theme. The 16 oz. double wall insulated tumbler comes with an iridescent insert, clear lid, and clear straw. Personalize the 6" high x 3 1/2" diameter tumbler by adding your choice of text and/or imprint design to one side of the tumbler; your one-color imprint will be screen printed on the tumbler. Add a customized Rainbow Wave Tumbler to every Prom swag bag or place setting! NOTE: The tumbler is BPA free. Not recommended for dishwasher or microwave.