-piece seamless silicone sleeve fits snugly around the 20oz body-tight glass (8.1 inch tall) for a comfortable fit. There are no space lines. Simply secure the seam with the included high-temperature sublimation tape, then slide the silicone sleeve until it wraps around the entire tight-fitting cup. No more ghost spots on top or bottom (Be patient and put the silicone sleeve on the cup)Silicone sublimation packaging is made of high-quality heat-resistant silicone, which is reusable and has a high safety factor, making full-wrapped sublimation printing easier, saving you money and time.Maximum Heat Resistance: 482 Fahrenheit/250 Celsius, never worry about it melting or sticking to your glass and ruining your work. Safe to use directly on the oven rack. Note: Adjust the optimal temperature and time during sublimation, do not use too high temperature for fast speed Using a silicone sleeve means saving money and time, no more tape wrapping or spending a lot of shrink wrap You will do your part to help reduce plastic and paper in waste streams and oceans, reducing secondary pollution to the environment. Create a green and low-carbon life together.The operation steps of the silicone sublimation sleeve are very simple. Step 1: Wrap the transfer paper completely and evenly around the tumblers. Step 2: Secure the top, bottom and any seams of the sublimation cup with heat resistant tape. Step 3: Slide the silicone sleeve out of the entire cup from bottom to top until it is fully covered and tightly wrapped (top). Step 4: Put in the oven (for oven use only) and heat for 7-9 minutes at around 375 Fahrenheit.Colour:C blackMaterial:Silica gelPackage Contents:1 * seamless heat-resistant silicone sleeve1 roll * heat transfer tape (cups not included in shipment)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.