This is a one-of-a-kind handmade item. It was carefully crafted by hand, using a dedicated knife and axe to carve a birch burl, followed by sanding. With regular maintenance, this kuksa can last a lifetime. It is finished with walnut oil. As you can see from the photos, this is an exquisite birch burl with a beautiful pattern. It's been carved to the limit to prevent leaks, making it lightweight, durable, and easy to carry. It's the perfect size for enjoying whiskey or coffee in the mountains, ideal for bushcraft or backpacking camping. ・Size: Width: approx. 12cm, Height: approx. 5cm ・Capacity: approx. 155cc ・Material: Birch burl ※Apply commercially available walnut oil regularly and wipe it off with a paper towel. Basically, use it by washing with water. If you have to use dish soap, rinse it well and apply oil promptly after it dries.