US giant Mars has issued a voluntary recall of its popular chocolate bars—including brands Mars, Snickers and Milky Way—in 55 countries, after a small piece of red plastic was found in a Snickers bar in Germany.

The controversial products were made in the Netherlands and the recall mostly affected European countries, such as France, Belgium, Italy and Britain, extending as far as Sri Lanka and Vietnam. On the contrary, New Zealand was not involved as its bars were mainly produced in Australia.

“We believe this is an isolated incident,” said the company in a statement. “Mars Netherlands exports to a number of countries and some duty-free outlets, so the easiest way for consumers to determine whether they have a product that has been recalled is to look at the label. If it is not labeled ‘Mars Netherlands,’ it is not included in the recall.”