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. iSi Cream Chargers should be used exclusively with iSi Whippers for best and consistent results. Use one per half-pint or pint size bottle fill, leak proof, has no expiration date, made of 100% recyclable steel.