Little plastic books that wont tear readily. The clear bright pictures unfortunately have no distinction one way or another, the pages have a tendency to stick together and must be peeled apart, and there is a decided smell to the new books. But the publishers claim that these are indestructibly bound, that they can be washed, scoured, sterilized, or put into the washing machine without damage. And the book can be chewed, stuck into the tub, slept with and sat on -- without damage to baby. The fragile, clear envelopes protect the books before they reach the final consumer. Merchandise item.