What you need to do is to place your substrate in a sublimation shrink wrap film, over a mug, tile, or other sublimation billet, then put the oven and wait for a few minutes to finish your product. Features - Color: White. - Material: PET. - Size: 26.00X13.00X0.20cm/10.22X5.11X0.08 inch. - These shrink wrap bags are made of PET material, odorless, safe and not easy to break. - Shrink wrap make it convenient to achieve impressive sublimation heat transfer effect. - No need for other heat transfer machine and what you need is film, sublimation blank and oven. - Flat items or even curved items can be inserted into these sublimation shrink wrap films, including mugs, metal sheets, ceramic tiles, plates, cell phone case, etc. - The excellent workmanship of our product will bring you a . Package list: Sublimation Shrink Wrap Sleeves