Approximately 54cm x 38cm in size, this is a size known as a "roku-tori tenban" (six-cut baking sheet). I'm not entirely sure as it was a gift, but judging by its lightness, I believe it's made of aluminum. It's for confectionery and bread making. I think it can also be used as a griddle for outdoor activities. #Rack Baking Sheet #BBQ #Camping Baking Sheet Thank you for looking.