Forget about thinking outside the box, now it’s time to think...inside AND outside the drinking glass! These trays are constructed of FDA approved silicone, so they work in freezer, fridge, or oven. To say it with food or ice cubes, all you have to do is pick your medium. Imagine spelling out I Love You in ice letters….teaching little ones to count with Jello numbers…or saying Happy Birthday in shortbread cookies…the possibilities are endless. Symbols such as question mark, quote marks, @ sign, exclamation will add to the fun of what you spell out. Choose from Letters sold as a set of 3 for $19.95, Numbers sold as a single tray for $9.95, or buy the set of Letters and Numbers for $29.90. 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. All trays are oven-safe to 550F and can be frozen to -50F. They are cool to the touch within minutes after backing; they’re non-stick and do not retain odors.Letter trays measure 4 1/2 inches W X 7 long X 3/4 of inch deep; Number and Symbol trays are 5 inches W X 8 inches long X 3/4 of an inch deep. Click Select Style below to choose.