Nang cylinders, additionally often called whipped cream chargers, are small metal canisters jam-packed with nitrous oxide

http://place-e.ru/index.php/Nang_Cylinders:_What_You_Need_to_Know_Before_You_Buy

Nang cylinders, also often called whipped cream chargers, are small metal canisters packed with nitrous oxide, probably used to create whipped cream quick in culinary packages.