The Cambridge Reading Adventures (CRA) series has five bands that have been made compatible to Pen Pal Whizz for children to learn and enhance their reading fluency at various levels. These readers cover different interesting themes for children to read extensively, while the fiction and non-fiction stories offer children a worldview of current events and experiences. Children will be drawn to the beautiful illustrations and stories that are easily relatable! (Suitable for children aged 4 to 5 years old)