iSi Brand N2O Chargers [$9.95 to $32.95] are considered the best quality nitrous for both making whipcream and for recreational use. Many consider them the only acceptable brand. Great fun for an summer-time party. Each iSi Cream Charger contains 8 g of pure N2O. All iSi Cream Chargers are made of high-quality, recyclable steel, individually weighed and have a fill warranty.