 Small size convenient to hold Premium quality with unique design eliminates odor and smoke Reduce second-hand reduce second-hand smoke total of two filter meshes This is your extra filter there are replaceable filters and You get one inside it and an extra one and that's up to 1,000 uses a lot of the Other brands It's kind of a one-time thing when it's done. You throw it out you buy a new one. This is a silicone. This is how you Change your filter you just unscrew that. Okay. You just pop it out And there's around it's kind of rounded on this edge and flat on this edge so you just put it in there and You're ready to go again And I'll tell you some more things about this soft silicon material design Two filters and a breathable mesh the mouth area is big And you don't need to blow hard for it to work Remove the screen when dirty or wet so you can clean the screen 1,000 uses for this filter and you get two filters. It's eight ounces 1.97 by 1.97 by 3.15 inches Can I use it in closed environment? Sure the filter collects the most of smoking odors when you smoke in a car or a Bedroom, let's take a puff of this Let's do that again with the filter Now those were a couple big drags. I was like hot box in a cigarette some other brands of filters It's just a one filter Deal you use it. You throw it away. This you can buy replacement filters for it is light. I Like it I mentioned That come in pink for you ladies