5 balls included</br>For use with ALL Playskool Ball Popper toys; Elefun Busy Ball Popper?? Busy Ball Popper?? Poppin' Park?? Explore N' Grow Busy Ball Popper?? etc.</br>Ball diameter: 1.75">Ages: 9 months and up</br></br>Product Description</br></br>5 balls included. For use with the Playskool Busy Ball Popper (Airtivity)?? or Elefun Poppin Park Playset. Ages: 9 months and up.</br><br/>http://www.amazon.com/gp/product/B00EICQXOIIby