As One Universal Bathtub, Capacity 4.6L, PB-2, Set of 12 External Dimensions (Width W x Depth D x Height H) (mm) Top/373 x 273 x 63 Purchased from Monotaro. The list price is ¥1,089 (tax included), so it can be quite expensive to buy in bulk. I hope you will take this opportunity to purchase them. Cleaned approximately 3 times.