[Application]: The seamlsilicone sleeves fit tightly all the way around the 20 oz sublimation tumbler skinny straight (8.1inch Tall) and give you a nice snug fit. The heat tape can help you install the image better.[Advantage]: The siliicone sleeve can tightly wrap and generate appropriate pressure to avoid the problem of the color or image at the bottom and top of the tumbler becoming lighter and vague. No shrink wrap or heat is required, and it can be applied and removed quickly and .[Heat-resistant sleeve]: The sublimation wrapping sleeve is made of heat-resistant silicone; The maximum heat resistance is 482 degrees fahrenheit/ 250 degrees celsius. You can safely put it in the oven and 't have to worry about it melting or sticking to the cup and your project.[Heat Tpae]: Heat resistant tape is a polyester film tape with a high temperature resistant adhesive. Maximum heat resistance: 482 (250),comes off clean,easy peal and no residue. It's really indispensable when sublimatiType: BMaterial:Silica gelcolour:GreenPackage Contents:2 x seamlsilicone sleeves2 rolls x heating tapeOnly 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.