This is the rough material for a kanna (Japanese plane) base. The material has been dried for over 10 years, and then processed to its current size and dried for over 5 years. The dimensions are: Length 440mm x Width 96mm x Thickness 33mm. Please be aware that the material may split or warp due to changes in environment during shipping. Thank you for viewing. Please check the photos carefully before purchasing and feel free to comment if you have any questions.