Wonder Balls are a spherical, thin shell of milk chocolate with candy inside, wrapped in foil and packaged with a collectible sticker. The product's slogan is "What's in the Wonder Ball?" Originally called Nestle Magic Ball, the product used to contain small figurines of Disney characters, similar to the Kinder Surprise which retails in Europe. However, due to choking hazard concerns, the product was withdrawn in 1997 In April 2000, the Wonder Ball was re-released with candy in place of the toys In 2004, the brand was sold to the Frankford Candy & Chocolate Company
When released again they made a new song as well, sampling "Book of Love" by The Monotones. That went like this:
Oh I wonder wonder what's in a Wonder Ball?
Who knows what surprises, a Wonder Ball may hide?
Yummy Nestle chocolate with candy shapes inside
Oh I wonder wonder what's in a Wonder Ball!