Ona Pro Gel is for professionals and now available for you. The first product in this series is ONA PRO Gel. As Ona constantly strives to improve our products, they have developed a formulation that takes control to a new level. ONA PRO Gel is nearly odorless. Although it has a slight scent when sniffed in the container, the final result when working on powerful, odors is simply a clean, fresh smell - period.