MITSUBISHI PENCIL Jet-Stream Refill 0.5mm is a high-quality writing instrument refill made by the Japanese brand, Mitsubishi Pencil. This refill is designed to fit into Jet-Stream ballpoint pens with a 0.5mm tip size. It is made with a special ink formula that glides smoothly across the paper, providing a comfortable and effortless writing experience. The Jet-Stream refill is known for its quick-drying ink, which prevents smudging and smearing on the paper. It is also water-resistant, fade-resistant, and resistant to light, making it ideal for use in a variety of settings. To use the Jet-Stream refill, simply remove the old refill from your Jet-Stream pen and insert the new one. Make sure to follow the manufacturer’s instructions for your specific pen model.