Dendrology Posters, Set of 11Whether you use our posters to spice up your classroom walls or as a teaching tool, we know your students will find them simple to understand and will want to study them. Our posters are unique because they are 1. Double sided. One side is labeled and the other is not so you can use it for quizzes or as an activity. 2. Only 11x17 inches (the size of two regular sheets of paper). This means they are easy to use as an interactive lesson with students.