This is a handmade ballpoint pen, featuring a twist mechanism to extend and retract the pen tip. Each pen is handcrafted, so there may be slight variations in size, weight, wood grain, and color. The wooden body is polished and finished with natural beeswax. ・Size: Approximately 130mm in length ・Weight: Approximately 22g ・Refill: Initial refill included Compatible refills: CROSS Oil-based ballpoint pen refill 8514, Mitsubishi Pencil Oil-based ballpoint pen refill SK 8, etc. To replace the refill, unscrew the black part by pulling out the upper barrel. Please note that as this is a handmade item, there may be minor imperfections. Thank you for your understanding.