Tough And Attractive Powder coated Finish. NX nitrous bottles feature a tough and attractive powdercoated finish. The NX Polished nitrous bottles feature a high luster finish for the ultimate in performance and style. Both include a high flow bottle valve. Wow, how do I start to tell the world why NX is different and better than any other company? NX copies no one; we lead the industry in technology and innovation; Never be satisfied with the status quo; Always give the customer more than he expects! Ve been in business for over15 years and are committed to providing excellent products with exceptional service. If you have any questions or problems, we are more than happy to address your concerns.