A product called Everlasting Gobstopper was introduced in 1976 by the Chicago candy company Breaker Confections. It had licensed the “Willy Wonka” name in 1971 so that their candy could be used as merchandising tie-ins for Willy Wonka & the Chocolate Factory film, which was released the same year. The Willy Wonka Candy Company brand has since been bought by Nestlé and production has been moved to Itasca, Illinois.
The everlasting gobstopper is similar to a normal gobstopper or jawbreaker and is composed of several discrete layers. The layers allow for the colour and flavour changing effects described in the book. They are available in a variety of different flavour combinations and usually have a chalky centre with a cherry flavour. A version with a chewy centre is also available.