This is a simple, plain word card. The two larger cards in the foreground come with green and red sheets for memorization, which is very convenient. Because of its simple design, I think it can be used by people of all ages ⊹ ࣪ ˖ _________________________________________ ・Instant purchase is OK ・I bought it several years ago, but there is no discoloration of the paper or any noticeable stains.