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These 11 oz mugs have a smooth, coated surface. The straight sides are ideal for sublimation printing with a heat press. The mugs are RED on the outside, bottom, and handle when cold. Heat activates the mug and turns the outside white to reveal your sublimated image. They are shipped in a box with 36 individual white gift boxes. INSTRUCTIONS: Set the temperature of your press to 180Â°c and put 180 seconds on the timer. Mirror the image before you print it on sublimation paper. Use high heat proof tape to secure the paper tightly around the mug. Do not preheat the mug. As soon as the sublimation paper touches heat the image will activate. Make sure it is centered in the cuff and the handle of the mug is to the far left. Press down the lever. If you use a World Paper mug press the timer will start automatically each time. Just wait for the beep and release the mug from the machine. Be careful, it’s hot. Make sure to hold it only by the handle.