I used two sheets of ready-rolled refrigerated puff pastry. Each roll weighs 275 g/ 10 oz and is about 25 cm/ 10 inches long.
You can use frozen puff pastry instead, either already rolled or a block. Defrost and roll (if necessary) according to the packet’s instructions.
These dimensions will fit if the pastry sheets are as large as mine. If they are larger or smaller, it won’t matter much. Just cut them into even rectangles.