Here's what Yamaha say about the CS40 3/4 Size Classical Guitar:

With its compact body and short 580mm scale length, the affordable Yamaha CS40 is designed with comfort in mind for the young learner (who may find a full-size instrument too cumbersome). Despite the reduced dimensions, the guitar still produces a responsive, well balanced tone and the specification includes a genuine rosewood fingerboard and bridge. An excellent starter instrument that will encourage youngsters to keep playing.