Only genuine iSi Cream Chargers can provide the quality and taste that discerning consumers want. Since they are made exclusively for our cream whippers, our chargers are perfectly designed and filled and they're backed by 100% quality control testing. To be sure you serve the very best, buy only the very best. Cream chargers made by iSi are leakproof, have no expiration date, are made of 100% recyclable steel, and are NSF certified. Ships via ground only. 8.4 Gram N20 Chargers.