Size of one brick: See the first image. Width: Approximately 11.5cm, Depth: Approximately 23cm Height: Approximately 6.5cm This is an alumina brick of SK40, the highest quality among firebricks in terms of refractoriness, strength, and heat retention. As it is a used item, there may be chips or fire-resistant mortar attached to the surface, but it has a good atmosphere combined with the color. I made an incinerator at home with these bricks. Because it is hard, it does not feel any deterioration even when exposed to rain and wind. You can use it with confidence outdoors. It has various uses, such as DIY and gardening. I also have other bricks of the same size for sale, and I have stock. Please let me know before purchasing if you wish.