Pen and marker from Japanese brand Kokuyo. Thanks to a semitransparent red plastic sheet, you can hide what you have written. This system is used in many Japanese books: they have been printed with 2 different types of ink and when you placed the semitransparent red plastic sheet over one page of the book, the parts printed in red ink become invisible.
Now, you can study by using this system. The pen has 2 different tips: a very thin one with which to write 2 millimeter strokes in orange color and the other one is a blue marker. The semitransparent red plastic sheet hides both.
This practical system can be used in many different ways: You can underline the answers or the words you wish to remember with the blue marker or you can write the reading of each kanji with the orange pen and then hide it to try to read without furigana.
REMARK: This item does not include the semitransparent red plastic sheet.
Kokuyo is a Japanese brand that was founded in 1905. Initially, this brand made book covers, however throughout the years, the founders explored new business and they started producing and making their own stationery products. Among the most popular products made by Kokuyo, there are the vocabulary cards, which are used by students from all around the word to learn and write kanji and vocabulary. The headquarters of Kokuyo are located in Osaka.