Instant purchase is welcome. ■ Product Description Write a message on a banana peel and give it! ~It appears over time~ "Banana Pen" is a pen that utilizes the oxidation of banana peels. Vinegar is used instead of ink. ■ How to use ① Remove the cap and write letters or draw pictures on the banana peel. ② Write with the feeling of lightly scratching the surface of the peel. ③ Transparent edible vinegar is used instead of ink. The color gradually darkens after writing. ④ The pen tip has two types: bold and fine, which can be used separately.