Large PECS Communication Book (Picture Exchange Communication System) Great for new PECS users! Includes one Large Sentence Strip, two Large Insert Pages and strips of hook (rough) VELCRO Brand for self assembly 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. Measures 10 1/4" x 9 1/4" - Available in red, orange, yellow, green, blue, purple, black Pictures sold separately.