This is a mechanical pencil using the internal mechanism of the first model from Nohara Kogei. The wood type is Japanese Zelkova (Keyaki), 0.5mm. It's likely rare as it's sold out on the official website. It has only been used a few times and is almost new. - Brand: Bonan - Color: Wood grain/Black - Material: Wood, Plastic - Accessories: Dedicated box - Model Name: Bonan Thank you for viewing.