Thank you very much for looking! The following is quoted from the internet: ● Simply a brush pen! (Uses weasel hair and horse hair) It's different! ■ A brush pen full of patents ● Uses weasel hair, horse hair, etc., and unlike conventional brush pens, you can enjoy the feel of a brush ● Transparent ink is included to protect the tip's original hair Remove the transparent ink and insert the special ink The ink will come out lightly at first, but will gradually become darker ● After use, straighten the tip and cap it properly [Manufacturer] Shihodo [Product Name] Patent Takara Spare Brush Pen [Product Dimensions] Tip diameter 2mm x Tip length 10mm, Shaft diameter 9.5mm x Shaft length 166mm [Dimensions with cap] Diameter 9mm x 183mm [Product Weight] 12g [Outer Packaging Dimensions] 54mm x 215mm x 13mm [Packaging Material] PE bag [Suggested Retail Price] 1890 yen The outer bag and backing card show signs of aging. For those who understand that this has been stored at home for a long time, thank you.