Cool Change Color Changing Insulated Mason Jar Set with Lid and Straw, 2 Mason Jars, 20 oz, Multicolor This set includes 2 plastic insulated mason jars with a lid and straw Simply add your favorite cold beverage and watch as the mason jar magically changes colors before your eyes The 20 ounce plastic mason jars are reusable and durable for multiple uses Cool Change products are the perfect party favor, birthday gift or and everyday kitchen item for the kids Cool Change products are No. 5 recyclable, BPA free and FDA approved