This is the Ring Card series from Toda Design Laboratory. Featuring bean-shaped cards and vibrant colors, it's well-known as an educational toy. You can attach it to a stroller or remove the rings and play it as a card game. Retail price: 2,000 yen per piece Target age: 0-3 years old Card types: A-I-U-E-O: A series for learning hiragana. WA-EI: Japanese-English bilingual cards. Unique Form: The cards are based on organic and warm shapes drawn freehand by the artist Koshiro Toda, and feature a unique design unlike any other similar product. Safe and Durable Construction: The rings open when an adult applies a little force. They are designed so that children cannot easily open them. The rings are not damaged, and all the cards are present. There are 4-5 cards with folds (see photos), but they are still usable. For those who understand that this is a used item. Will be sent without the box, with the rings removed.