These are study cards from Waseda Zemi, known for their reliability and results. Instead of tackling a thick textbook, why not do a comprehensive review with these cards, which Waseda Zemi has compiled based on data, summarizing the key points? Each set is about 10 cards, making them easy to carry. Take a set with you and study "on the go" during your commute. Replace an hour of smartphone time with these cards! Detailed explanations are included on the back, so you won't be left in the dark. Sold as a set of 20. Definitely worth a try ✨ Please refrain from price negotiations. - Contents: Study cards, various themes - Design: Illustrated, colorful covers - Format: Ring-bound, portable - Features: Includes explanations, both questions and answers - Uses: For studying and review, for educational purposes