This product contains wide mouth mason jar (glass), tinplate, tinplate ring, hand lettering service. Clearly see the contents of the cup, the wide mouth is designed to be clean. Hand lettering service to create your unique Mason Cup and glass. Please note your engraving content on the conclusion page (limited to 5 words in Chinese or 10 letters in English) Can be used to drunk food, can be used directly as a cup or with a straw. The heat resistance temperature of the glass mason cup is -18 degrees Celsius to 220 degrees Celsius, and the maximum instantaneous heat resistance temperature difference is 50 degrees. The Mason Jar, produced by Ball®, has a glorious history of selling for over 100 years. In 1858, John Landis Mason invented a three-piece sealed storage tank. In the absence of refrigerators and artificial preservatives, Mr. Mason designed a square-shoulder jar that was accepted by a peripheral threaded groove. The metal cap, the transparent bottle body can clearly see the state of the contents. A ring of sealing strip on the gasket can be vacuumed by heating. Effectively extend the shelf life of food, suitable for preserving jam or pickled various ingredients.