The Small PECS Communication book is a 7 1/4" x 6 1/4", 6-ring binder that is perfect for students who use 1"x 1" pictures to communicate or who have a smaller vocabulary of larger pictures. This picture-ready PECS Communication Book is made of thick poly plastic material that is smooth to the touch, yet extremely durable. The back of the book is longer than the front to accommodate the Sentence Strip™. This allows access to the Sentence Strip no matter which page in the book is in use. The book..