The Gobel Aluminium Perforated Pastry Sheet measures 400 by 300 by 10 millimeters and comes in a pack of 5. These perforated pastry sheets are designed for professional baking applications. The aluminum construction ensures even heat distribution for consistent baking results. The perforations help to promote airflow, which aids in achieving a crispy crust when baking pastries, bread, or other baked goods. This pack of pastry sheets is suitable for use in commercial bakeries, pastry shops, or by home bakers seeking professional quality equipment.