I've customized the rubber grip of a Jetstream 4&1 multi-pen with African Blackwood. It has a beautiful wood grain. It's finished with a combination of glass coating and beeswax wax. This listing is for the metal tip and the wooden part only. The pen body is not included. No warranty is provided. It will be wrapped in bubble wrap and shipped via Nekopos (a Japanese postal service). Shipping will be on weekends due to my schedule, so please allow some time. For those who appreciate handmade items, how about it, including shipping? African Blackwood is also known as "Grenadilla" and is one of the heaviest and hardest woods. The grain is similar to ebony, but finer and more complex, resulting in a finish that is incredibly glossy, almost unbelievable for wood. It is used for clarinets and oboes. How about it as a companion for brass band activities? Thank you for looking. I love stationery and use Jetstream and Dr. Grip 4&1 pens. I didn't like the deterioration of the rubber, so I started making them for myself using scrap wood from the famous trees 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 Kusabi, 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 Burl, Karin Red and White, Snake Wood, Pink Ivory, Desert Ironwood, Black Persimmon, Black Persimmon Peacock Grain, Red Sandalwood, Ebony, Rosewood, Sandalwood, Palo Santo, Briar, Rosewood, and Satine. #jnsm