This set includes everything pictured: The bell cylinder, interlocking discs, ring rattle, the bell cube, and the ball cylinder. These Montessori materials promote fine motor and gross motor development and are very satisfying for babies. They are used from about 4 months onward, when babies begin to reach for and grab things. They are used for auditory and tactile stimulation for young infants. All these items are made with non-toxic materials.