50th birthday party...Sweet 16...25 years in business...imagine celebrating with ice cubes customized to these auspicious dates. These trays are constructed of FDA approved silicone, so unlike traditional ice cube trays, they work in freezer, fridge, or oven...with a lot more than water. Just pick your medium: water, chalk, crayons, shortbread cookies…teach little ones to count with Jello numbers…create crayons in the shape of 3’s as a favor for a three year’s old birthday party; the possibilities are truly infinite. Measures 8 inches x 5 inches x 3/4 of an inch. When using for baking, works best with a non-riseable, denser product like shortbread or brownies. When using jello, use Jiggler brand jello as it's specific for making stiffer Jello; flash freeze the jello letters for around 15 minutes in the freezer then put in the refrigerator to complete hardening to aid in letters coming out of the tray.