Use 2 layers of baking parchment, 1 of which cut to the size of the inside of the pan, so that you can remove your cake from the pan without problems. The ring is easily adjusted on two sides; lengthwise adjustable between 22 and 41 cm, and the width is adjustable between 25 and 50 cm. Perfect for both square and rectangular cakes! Made of high quality stainless steel, dishwasher safe.