I have customized a multi-function pen, the Pure Malt Premium 3&1, with a Karelian burl wood. It has four functions (black, red, blue BP + 0.5mm SP) and a pendulum mechanism. The ballpoint pens use the 4C standard, and Jetstream refills are compatible. Multi-function pens with wooden shafts are rare. With four functions in one pen, why not add one to your pen case? The pen is new. I am not considering discounts. There is no warranty. For those who understand handmade items, how about it, including shipping? The product will be shipped in a box via Takkyubin Compact. Shipping will be on weekends due to my schedule, so it will take a little time. □About Karelian Burl Karelian burl is a burl (knot) material that can only be harvested from a part of the root of the Karelian tree, and has been popular as a material for high-end crafts since ancient times. Its grain is very beautiful, and the various patterns created by the complexly intersecting wood grain can truly be called a natural beauty. In particular, the areas where dark and light colors are mixed are called "Kohaku" (red and white) and are very valuable. Currently, imports have stopped, making it increasingly difficult to obtain. Thank you for viewing. I love stationery and use Jetstream and Dr. Grip 4&1 pens. I dislike the deterioration of the rubber, so I started making them for myself using scrap wood from the famous trees I used to collect. You can customize these practical pens to your liking, just like changing your smartphone cover. I hope that the wooden shaft pens and wood parts I create will be of some help in your daily work, studies, tests, certification exams, and entrance exams. For those who like handmade wooden shaft pens, those who like the works of wooden shaft workshops such as Craft A, Nohara Kougei, Koubou Setsuri, Kobuta Koubou, etc., and those who like multi-function pens such as Jetstream 4&1, Dr. Grip 4&1, and Pure Malt Premium 2&1, how about it? I create them using Karelian burl, Karelian Kohaku (red and white), snakewood, pink ivory, desert ironwood, persimmon, persimmon peacock grain, red sandalwood, ebony, rosewood, sandalwood, palo santo, briar, rosewood, and satine. #jnsm