Cream chargers are small canisters crammed with nitrous oxide

https://wiki.fc00.ru/index.php?title=Exploring_the_Art_of_Culinary_Foam_with_N2O_Whipped_Cream_Chargers

Cream chargers are small canisters crammed with nitrous oxide, used to whip cream simply and create fluffy toppings for cakes and beverages