Naturalin natural. Thanks to the Stainless Steel Metal Beads, Difficult-to-clean Containers Will be Clean in No Time. Narrow Bottle Neck or Other Constrictions? Not Problem. with the Reusable Cleaning Beads & Little Water, Deposits Are Gently Removed by Shaking. This Way, Drink Bottles, Carafes & the Like Will be Shiny & Clean Again, Just Like New. Minimum Quantities Apply.