That's the Thumbnail for this video. That specific speaker is included just to show viewers what a 6.5 inch car speaker looks like before they open the video.
Hello. My adice is to go with the following sizes for your Mercedes B180: 1. Front Door Speakers: 6.5 inches (165mm) Compare the best options here: audiorevamp.com/best-6-5-inch-car-speakers-top-10-picks/ 2. Rear Door Speakers: 5.25 inches (130mm) Some good options to choose from: audiorevamp.com/best-5-25-speakers/ 3. Dash Tweeters: 1 inch (25mm)