12pcs 8x3.5cm Sunflower Sublimation Key Rings Heat Transfer Printable Size is 2.5cm x 2.5cm, Press Temperature is 180C(365F) and Press Time is 60-80seconds. Metal key ring, you can print the image which you like on the metal board. And it is use like key ring, can show to other people, it is a good gift for other peoples. Note: Before you print an image on the metal sheet, please peel off the protective film.