blank sublimation glass: You can DIY or design these straight glass tumblers according to practice your manual ability and aesthetics ability. As a gift: You can choose your favorite patterns and pictures, and then transfer them to our blank glass tumbler. It will be a nice present for your friends and family. Specifications: Material: Borosilicate glass Package includes: 20 x Sublimation blank glass tumbler Notes: Manual measurement, please allow slight errors on size. The color may exist slight difference due to different screen displays.