I modified the rubber parts of a Jetstream 4&1 multi pen's lead advance mechanism with purpleheart wood. It has a combined finish of glass coating and beeswax wax. This listing is for the metal lead advance mechanism and the wooden parts only. The pen body is not included. It will be wrapped in bubble wrap and shipped via Nekopos. About Purpleheart: It is distributed in tropical regions of Central and South America, including southern Brazil. Immediately after being sawn, it has a vibrant purple color, as the name suggests, that you wouldn't believe is natural. Over time, when exposed to ultraviolet light, it gradually changes to a deep purplish-brown. Despite its flashy appearance, it is a material with excellent durability and rot resistance. 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 famous trees that I had collected. You can customize these practical pens to your liking, just like changing your smartphone case. I hope that my wooden pen shafts and wood parts can be of some help in your daily work, studies, tests, certification exams, and entrance exams. For those who like handmade wooden pen shafts, those who like the works of wooden pen 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 famous woods such as Karin瘤 (Karin burl), Karin Kouhaku (Karin red and white), Snakewood, Pink Ivory, Desert Ironwood, Kurogaki (black persimmon), Kurogaki Kujaku Moku (black persimmon peacock grain), Beniki (red wood), Ebony, Rosewood, Sandalwood, Palo Santo, Briar, and Satine. #jnsm