Instant purchase OK. This is a set sale, please understand. This is a set of 6 books from the Survival Series. There are some creases and scratches on the covers, but the inside is clean, so I think you can still read them. Survival in the Center of the Earth 1️⃣ Survival in the Robot World 1️⃣ Survival in the Air Pollution Survival in the Deep Sea Survival in the Skyscraper 1️⃣・2️⃣