There are holes on the lid of the metal can, and there are creative shapes of the ventilation holes. The material is safe and reliable. The food grade pure aluminum material is used, which is odorless, and the assured. The lid has holes for dogs to smell, thus can also training dog snuffle ability. Features - ColorSilver -Material:Aluminum - Size: 6.80X6.80X2.60cm/2.67X2.67X1.02in -This incense diffuser is made of premium Aluminum material, simple design, durable and safe for a long term use. -Fine polishing workmanship ensures the smooth surface without burr and makes it safe to use. -Perfect for the use in the bedroom, living room, study and office, etc. Suitable for different places. -This Aluminum box is not only a practical aroma diffuser, but also a delicate desktop and vehicle decoration. - Multifunctional: The lid has holes for dogs to smell, thus can also training dog snuffle ability. Package list: 10 x air freshener Diffuser Box