Traytastic Silicon Alphabet Mold and Number Trays have been creatively designed in mirror-image to provide the cleanest edges for your masterpiece! These are great for crayons, candles, frosting, cakes, muffins, jello, ice, soaps, chocolate, gummies, treats and more! Usage Instructions: Prior to first use, wash silicone trays with soap and hot water (always rinse and dry completely after washing.) Do not expose to an open flame, burner, broiler, or use on a grill. Traytastic trays feature an easy release design - do not use any sharp objects as they can damage the trays. Specifications: Dishwasher safe. Oven-safe to 446 degrees Fahrenheit and Freezer-safe to -40 degrees Fahrenheit. *please note that letter sizes may vary depending on the letter. If you are making crayons, these molds work great with our CRAYTASTIC brand Bulk box of crayons! Our crayon line now includes a version without wrappers, perfect for melting! Usage Notes: These molds are meant for casual (not commercial) usage. Excessive use or crafting with heavy materials may result in reduced lifetime of the molds. Always do proper research on appropriate temperatures for your particular craft. For best results, do not place molds too close to oven elements. Keep in mind that consumer ovens can vary wildly in temperature, typically from 50 degrees below to 50 degrees above the setting.