Say hello to a corrosion-resistant alternative to steel and aluminum. All plastic diffusers Made from engineered polymers, our Stratus Diffusers are designed to outperform and outlast comparable metal diffusers. In fact, this revolutionary new plastic product won't rust, fade or corrode due to its unique properties. Plus, it's a cost-effective option Available in Cone or Plaque, Stratus Plastic Diffusers also features an extra tall neck for easy installation. All Plastic Diffusers Meets UL 2043 Fire Rating Won't rust, corrode or fade Dishwasher safe Never needs painting Indistinguishable from metal when installed Available in both Cone and Plaque styles, white and black , Stratus Diffusers are perfect for: Restaurants Hospitals MRI Centers Theaters Food Processing Offices Commercial Buildings Clean Environments